diff --git a/.ci/probe_microbench.py b/.ci/probe_microbench.py
new file mode 100644
index 00000000..356856ff
--- /dev/null
+++ b/.ci/probe_microbench.py
@@ -0,0 +1,156 @@
+"""Windows test-duration probe microbenchmarks (investigation branch).
+
+Times, in isolation (outside pytest), the operations involved in per-test config
+validation, to explain the ~19x slower fixture *setup* on Python 3.11 Windows.
+
+  1. socket.getaddrinfo() for the bogus host in GALILEO_CONSOLE_URL ("localtest")
+  2. asyncio event-loop create/close churn
+  3. cross-thread dispatch latency: run_coroutine_threadsafe round-trip onto a
+     background run_forever loop — this is exactly what galileo_core's async_run /
+     EventLoopThreadPool does for every validation request. THE key measurement.
+  4. GalileoPythonConfig.get() — the per-test autouse fixture (real, unmocked).
+
+Set PROBE_EVENT_LOOP=selector to force the WindowsSelectorEventLoopPolicy so the
+default Proactor loop can be A/B'd against it. Everything is timestamped/flushed.
+"""
+
+import asyncio
+import contextlib
+import datetime
+import os
+import socket
+import sys
+import threading
+import time
+from collections.abc import Callable
+
+# Force the selector loop BEFORE any asyncio object is created, if requested.
+_FORCED = "default(Proactor on win32)"
+if (
+    os.environ.get("PROBE_EVENT_LOOP") == "selector"
+    and sys.platform == "win32"
+    and hasattr(asyncio, "WindowsSelectorEventLoopPolicy")
+):
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+    _FORCED = "forced WindowsSelectorEventLoopPolicy"
+
+# Make `galileo` importable (installed with --no-root; pytest uses pythonpath=src).
+_src = os.path.join(os.getcwd(), "src")
+if os.path.isdir(_src):
+    sys.path.insert(0, _src)
+
+
+def _ts() -> str:
+    return datetime.datetime.now().strftime("%H:%M:%S.%f")[:-3]
+
+
+def log(msg: str) -> None:
+    # Write straight to stdout (not print()) so ruff's T201 autofix can't strip it.
+    sys.stdout.write(f"[BENCH {_ts()}] {msg}\n")
+    sys.stdout.flush()
+
+
+def bench(label: str, fn: Callable[[], object], n: int = 5) -> list[float]:
+    samples = []
+    last_exc = None
+    for _ in range(n):
+        t = time.perf_counter()
+        try:
+            fn()
+        except Exception as e:
+            last_exc = e
+        samples.append(time.perf_counter() - t)
+    summary = ", ".join(f"{x * 1000:.1f}ms" for x in samples)
+    total = sum(samples) * 1000
+    avg = total / len(samples)
+    log(f"{label}: avg={avg:.1f}ms total={total:.1f}ms exc={type(last_exc).__name__ if last_exc else None}")
+    log(f"    samples=[{summary}]")
+    return samples
+
+
+log(f"python {sys.version}")
+log(f"platform {sys.platform}")
+log(f"event loop policy: {type(asyncio.get_event_loop_policy()).__name__} ({_FORCED})")
+
+# 1) Name resolution — the prime suspect. "localtest" is intentionally bogus.
+log("--- getaddrinfo ---")
+for host in ("localtest", "localhost", "127.0.0.1"):
+    bench(f"getaddrinfo({host!r}, 8088)", lambda host=host: socket.getaddrinfo(host, 8088), n=5)
+
+# 2) asyncio event-loop churn (create + close).
+log("--- asyncio loop churn ---")
+
+
+def _loop_cycle() -> None:
+    loop = asyncio.new_event_loop()
+    loop.close()
+
+
+bench("asyncio new+close", _loop_cycle, n=50)
+
+# 3) Cross-thread dispatch latency. A background thread runs run_forever(); we
+#    submit coroutines from the main thread via run_coroutine_threadsafe and
+#    block on the result — the exact shape of galileo_core's async_run. This
+#    isolates the per-call wakeup cost of the event loop, which is what differs
+#    between the Proactor and Selector loops on Windows.
+log("--- cross-thread dispatch (run_coroutine_threadsafe round-trip) ---")
+_bg_loop = asyncio.new_event_loop()
+log(f"background loop type: {type(_bg_loop).__name__}")
+_bg_thread = threading.Thread(target=_bg_loop.run_forever, daemon=True)
+_bg_thread.start()
+
+
+async def _noop() -> int:
+    return 1
+
+
+def _dispatch_noop() -> None:
+    asyncio.run_coroutine_threadsafe(_noop(), _bg_loop).result()
+
+
+bench("dispatch noop (pure wakeup, no I/O)", _dispatch_noop, n=50)
+
+
+async def _yield_chain() -> None:
+    for _ in range(20):
+        await asyncio.sleep(0)
+
+
+def _dispatch_yield() -> None:
+    asyncio.run_coroutine_threadsafe(_yield_chain(), _bg_loop).result()
+
+
+bench("dispatch 20x await sleep(0) (ready-callback iterations)", _dispatch_yield, n=50)
+
+
+async def _tiny_sleeps() -> None:
+    # 1ms requested x10. On Windows the ~15.6ms timer tick rounds each up.
+    for _ in range(10):
+        await asyncio.sleep(0.001)
+
+
+def _dispatch_tiny() -> None:
+    asyncio.run_coroutine_threadsafe(_tiny_sleeps(), _bg_loop).result()
+
+
+bench("dispatch 10x await sleep(0.001) (timer granularity)", _dispatch_tiny, n=20)
+
+_bg_loop.call_soon_threadsafe(_bg_loop.stop)
+
+# 4) GalileoPythonConfig.get — the per-test autouse fixture, REAL (no mocks).
+log("--- GalileoPythonConfig.get (unmocked: hits real localtest resolution) ---")
+os.environ.setdefault("GALILEO_CONSOLE_URL", "http://localtest:8088")
+os.environ.setdefault("GALILEO_API_KEY", "api-1234567890")
+try:
+    from galileo.config import GalileoPythonConfig
+
+    def _config_get() -> None:
+        cfg = GalileoPythonConfig.get(console_url="http://localtest:8088", api_key="api-1234567890")
+        with contextlib.suppress(Exception):
+            cfg.reset()
+
+    bench("GalileoPythonConfig.get+reset", _config_get, n=2)
+except Exception as e:
+    log(f"config import/get failed: {type(e).__name__}: {e}")
+
+log("done")
diff --git a/.ci/probe_yappi.py b/.ci/probe_yappi.py
new file mode 100644
index 00000000..0bc7f2d7
--- /dev/null
+++ b/.ci/probe_yappi.py
@@ -0,0 +1,101 @@
+"""Thread-aware profile of the per-test config validation (investigation branch).
+
+cProfile only sees the calling thread, but galileo_core runs the 3 validation
+requests on a background EventLoopThread — so we use yappi (wall-clock, all
+threads, builtins) to attribute where the ~12x-more timer-quantized waits on
+Python 3.11 Windows actually accrue.
+
+Reproduces the *mocked* path (respx), i.e. the real test conditions (~685 ms on
+3.11), NOT the unmocked DNS path. Profiles N config.get()+reset() cycles.
+"""
+
+import contextlib
+import datetime
+import os
+import sys
+from unittest.mock import patch
+from uuid import uuid4
+
+_src = os.path.join(os.getcwd(), "src")
+if os.path.isdir(_src):
+    sys.path.insert(0, _src)
+
+os.environ.setdefault("GALILEO_CONSOLE_URL", "http://localtest:8088")
+os.environ.setdefault("GALILEO_API_KEY", "api-1234567890")
+
+
+def _ts() -> str:
+    return datetime.datetime.now().strftime("%H:%M:%S.%f")[:-3]
+
+
+def log(msg: str) -> None:
+    sys.stdout.write(f"[YAPPI {_ts()}] {msg}\n")
+    sys.stdout.flush()
+
+
+import respx  # noqa: E402
+import yappi  # noqa: E402
+
+from galileo.config import GalileoPythonConfig  # noqa: E402
+
+_USER = {"id": str(uuid4()), "email": "user@example.com", "role": "user"}
+_N = 10
+_ok = 0
+_last_exc = None
+
+
+def _one_cycle() -> None:
+    global _ok, _last_exc
+    try:
+        cfg = GalileoPythonConfig.get(console_url="http://localtest:8088", api_key="api-1234567890")
+        with contextlib.suppress(Exception):
+            cfg.reset()
+        _ok += 1
+    except Exception as e:
+        _last_exc = e
+
+
+log(f"python {sys.version.split()[0]} platform {sys.platform}")
+
+with (
+    patch("galileo_core.schemas.base_config.jwt_decode", return_value={"exp": float("inf")}),
+    respx.mock(assert_all_called=False) as router,
+):
+    router.get(url__regex=r".*/healthcheck.*").respond(200, json={"status": "ok"})
+    router.post(url__regex=r".*/login/api_key.*").respond(200, json={"access_token": "secret_jwt_token"})
+    router.get(url__regex=r".*/current_user.*").respond(200, json=_USER)
+
+    _one_cycle()  # warmup: also spins up the (one-time) EventLoopThreadPool
+    log(f"warmup ok={_ok} exc={type(_last_exc).__name__ if _last_exc else None}")
+
+    yappi.set_clock_type("wall")
+    yappi.start(builtins=True)
+    for _ in range(_N):
+        _one_cycle()
+    yappi.stop()
+
+log(f"profiled {_N} cycles, ok={_ok}/{_N + 1}, last_exc={type(_last_exc).__name__ if _last_exc else None}")
+
+# Per-thread wall time (which thread holds the cost).
+log("================ THREAD STATS ================")
+yappi.get_thread_stats().print_all()
+
+# Top functions by total wall time across ALL threads. ncall reveals how many
+# times each is hit per run — the 3.10 vs 3.11 delta should show as ncall.
+log("================ TOP 50 FUNCTIONS BY ttot (all threads, builtins) ================")
+stats = yappi.get_func_stats()
+stats.sort("ttot", "desc")
+for i, s in enumerate(stats):
+    if i >= 50:
+        break
+    sys.stdout.write(f"  ttot={s.ttot * 1000:9.1f}ms tsub={s.tsub * 1000:9.1f}ms ncall={s.ncall:>8} {s.full_name}\n")
+sys.stdout.flush()
+
+# Explicitly surface the usual Windows-wait suspects regardless of rank.
+log("================ WAIT/SLEEP/POLL SUSPECTS ================")
+_needles = ("sleep", "select", "GetQueuedCompletionStatus", "_run_once", "getaddrinfo", "poll", "wait", "Overlapped")
+for s in stats:
+    if any(n.lower() in s.full_name.lower() for n in _needles):
+        sys.stdout.write(f"  ttot={s.ttot * 1000:9.1f}ms ncall={s.ncall:>8} avg={s.tavg * 1000:7.3f}ms {s.full_name}\n")
+sys.stdout.flush()
+log("done")
diff --git a/.github/workflows/ci-tests.yaml b/.github/workflows/ci-tests.yaml
index e6f1f530..42b710f0 100644
--- a/.github/workflows/ci-tests.yaml
+++ b/.github/workflows/ci-tests.yaml
@@ -21,13 +21,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        # INVESTIGATION BRANCH: trimmed to the two cells that bracket the
+        # Windows slowdown — 3.10 (fast: ~6 min) vs 3.11 (slow: ~28 min).
+        os: [windows-latest]
+        python-version: ["3.10", "3.11"]
 
     runs-on: ${{ matrix.os }}
-    # Hard cap per matrix job — bail out fast on real hangs instead of
-    # burning CI minutes up to the GitHub-default 6h ceiling.
-    timeout-minutes: 30
+    # Raised from 30 -> 45 so the instrumented full run (~23 min on 3.11) plus
+    # the extra diagnostic steps don't get truncated by the timeout.
+    timeout-minutes: 45
 
     steps:
       - name: Checkout
@@ -38,14 +40,14 @@ jobs:
         run: git config --system core.longpaths true
 
       - name: Install poetry
-        run: pipx install poetry==2.1.3
+        run: pipx install poetry==2.4.1
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           cache: "poetry"
           python-version: ${{ matrix.python-version }}
-          cache-dependency-path: "pyproject.toml"
+          cache-dependency-path: "poetry.lock"
 
       - name: Install invoke
         run: pipx install invoke
@@ -53,10 +55,60 @@ jobs:
       - name: Install Dependencies
         run: invoke install
 
-      - name: Validate Types
+      # All diagnostic steps below run in Git-bash (present on Windows runners)
+      # so heredocs, pipes, and `head` behave consistently regardless of pwsh.
+      # Ordered cheap -> expensive: the fast probes land their data even if the
+      # full instrumented run later hits the timeout.
+
+      - name: "[probe] Environment + dependency dump"
+        if: always()
+        shell: bash
+        run: |
+          echo "::group::interpreter"
+          poetry run python -VV
+          poetry run python -c "import sys, asyncio, platform; print('platform:', platform.platform()); print('loop_policy:', type(asyncio.get_event_loop_policy()).__name__)"
+          echo "::endgroup::"
+          echo "::group::poetry show"
+          poetry show
+          echo "::endgroup::"
+
+      - name: "[probe] Verify Poetry Python version"
+        if: always()
+        shell: bash
+        run: |
+          poetry run python -c "
+          import sys
+          expected = tuple(map(int, '${{ matrix.python-version }}'.split('.')))
+          actual = sys.version_info[:len(expected)]
+          print('Python:', sys.version)
+          assert actual == expected, f'Expected Python {expected}, got {actual}'
+          "
+
+      # FIX VERIFICATION: the autouse set_validated_config fixture now bypasses
+      # the slow async validation round-trips (HYBIM-790). The conftest timing
+      # plugin prints the per-test "setup avg"; compare against the recorded
+      # pre-fix baselines (subset serial: 685ms on 3.11 / 55ms on 3.10; full
+      # suite parallel: 1335ms on 3.11). If the fix works, 3.11 setup collapses
+      # toward 3.10 and the full suite drops from ~23min to a few minutes.
+
+      - name: "[probe] Microbench (getaddrinfo / asyncio / dispatch)"
+        if: always()
+        shell: bash
+        run: poetry run python .ci/probe_microbench.py
+
+      - name: "[probe] Subset serial (setup avg WITH fix)"
         if: always()
-        run: invoke type-check
+        shell: bash
+        run: |
+          echo "[probe $(date -u +%H:%M:%S)] subset serial — with fix"
+          poetry run pytest tests/test_configuration.py -o addopts= \
+            -p no:xdist --disable-socket --allow-hosts=127.0.0.1,localhost \
+            -p no:cacheprovider --durations=0 -q
 
-      - name: Run Tests
+      - name: "[probe] Full suite (setup avg + total WITH fix)"
         if: always()
-        run: invoke test-report-xml
+        shell: bash
+        run: |
+          echo "[probe $(date -u +%H:%M:%S)] full suite start — with fix"
+          poetry run pytest tests --durations=0 -ra -q
+          echo "[probe $(date -u +%H:%M:%S)] full suite end — with fix"
diff --git a/galileo-a2a/pyproject.toml b/galileo-a2a/pyproject.toml
index da6538e1..f3a9a925 100644
--- a/galileo-a2a/pyproject.toml
+++ b/galileo-a2a/pyproject.toml
@@ -69,7 +69,7 @@ python_files = ["test_*.py"]
 python_classes = ["Test*"]
 python_functions = ["test_*"]
 env = [
-    "GALILEO_CONSOLE_URL=http://localtest:8088",
+    "GALILEO_CONSOLE_URL=http://fake.test:8088",
     "GALILEO_API_KEY=api-1234567890",
     "GALILEO_PROJECT=test-project",
     "GALILEO_LOG_STREAM=test-log-stream",
diff --git a/galileo-a2a/tests/conftest.py b/galileo-a2a/tests/conftest.py
index 217e599d..22e5d807 100644
--- a/galileo-a2a/tests/conftest.py
+++ b/galileo-a2a/tests/conftest.py
@@ -9,7 +9,7 @@
 # 3. Security - prevents real API keys from leaking into test logs
 import os
 
-os.environ["GALILEO_CONSOLE_URL"] = "http://localtest:8088"
+os.environ["GALILEO_CONSOLE_URL"] = "http://fake.test:8088"
 os.environ["GALILEO_API_KEY"] = "api-1234567890"
 os.environ["GALILEO_PROJECT"] = "test-project"
 os.environ["GALILEO_LOG_STREAM"] = "test-log-stream"
diff --git a/galileo-adk/pyproject.toml b/galileo-adk/pyproject.toml
index f8be13b3..57ad7c88 100644
--- a/galileo-adk/pyproject.toml
+++ b/galileo-adk/pyproject.toml
@@ -41,7 +41,7 @@ python_files = ["test_*.py"]
 python_classes = ["Test*"]
 python_functions = ["test_*"]
 env = [
-    "GALILEO_CONSOLE_URL=http://localtest:8088",
+    "GALILEO_CONSOLE_URL=http://fake.test:8088",
     "GALILEO_API_KEY=api-1234567890",
     "GALILEO_PROJECT=test-project",
     "GALILEO_LOG_STREAM=test-log-stream",
diff --git a/galileo-adk/tests/conftest.py b/galileo-adk/tests/conftest.py
index 843976a5..bb30b0a5 100644
--- a/galileo-adk/tests/conftest.py
+++ b/galileo-adk/tests/conftest.py
@@ -168,7 +168,7 @@ def set_validated_config(
     # Reset any cached loggers from previous tests
     GalileoLoggerSingleton().reset_all()
 
-    config = GalileoPythonConfig.get(console_url="http://localtest:8088", api_key="api-1234567890")
+    config = GalileoPythonConfig.get(console_url="http://fake.test:8088", api_key="api-1234567890")
     yield
     # Clean up after test
     GalileoLoggerSingleton().reset_all()
diff --git a/poetry.lock b/poetry.lock
index 8c6872ac..a1acafdf 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.2.0 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.4.1 and should not be changed by hand.
 
 [[package]]
 name = "aiohappyeyeballs"
@@ -484,7 +484,7 @@ files = [
     {file = "cffi-1.17.1-cp39-cp39-win_amd64.whl", hash = "sha256:d016c76bdd850f3c626af19b0542c9677ba156e4ee4fccfdd7848803533ef662"},
     {file = "cffi-1.17.1.tar.gz", hash = "sha256:1c39c6016c32bc48dd54561950ebd6836e1670f2ae46128f67cf49e789c52824"},
 ]
-markers = {main = "(extra == \"openai\" or extra == \"all\" or extra == \"crewai\") and python_version <= \"3.13\" or platform_python_implementation == \"PyPy\" or extra == \"openai\" or extra == \"all\"", test = "platform_python_implementation == \"PyPy\""}
+markers = {main = "(python_version <= \"3.13\" or extra == \"langchain\" or extra == \"all\" or extra == \"openai\") and (platform_python_implementation != \"PyPy\" or extra == \"langchain\" or extra == \"all\") and (python_version <= \"3.13\" or platform_python_implementation == \"PyPy\" or extra == \"openai\" or extra == \"all\") and (extra == \"openai\" or extra == \"all\" or extra == \"crewai\" or extra == \"langchain\") and (extra == \"openai\" or extra == \"all\" or extra == \"crewai\" or platform_python_implementation == \"PyPy\")", test = "platform_python_implementation == \"PyPy\""}
 
 [package.dependencies]
 pycparser = "*"
@@ -589,6 +589,7 @@ files = [
     {file = "charset_normalizer-3.4.3-py3-none-any.whl", hash = "sha256:ce571ab16d890d23b5c278547ba694193a45011ff86a9162a71307ed9f86759a"},
     {file = "charset_normalizer-3.4.3.tar.gz", hash = "sha256:6fce4b8500244f6fcb71465d4a4930d132ba9ab8e71a7859e6a5d59851068d14"},
 ]
+markers = {main = "python_version < \"3.13\" and (extra == \"crewai\" or extra == \"all\" or extra == \"langchain\" or extra == \"openai\" or extra == \"otel\") or extra == \"langchain\" or extra == \"all\" or extra == \"openai\" or extra == \"otel\" or python_version <= \"3.13\" and (extra == \"langchain\" or extra == \"all\" or extra == \"openai\" or extra == \"otel\" or extra == \"crewai\")"}
 
 [[package]]
 name = "chromadb"
@@ -933,6 +934,7 @@ files = [
     {file = "distro-1.9.0-py3-none-any.whl", hash = "sha256:7bffd925d65168f85027d8da9af6bddab658135b840670a223589bc0c8ef02b2"},
     {file = "distro-1.9.0.tar.gz", hash = "sha256:2fa77c6fd8940f116ee1d6b94a2f90b13b5ea8d019b98bc8bafdcabcdd9bdbed"},
 ]
+markers = {main = "(extra == \"crewai\" or extra == \"all\" or extra == \"openai\") and python_version <= \"3.13\" or extra == \"openai\" or extra == \"all\""}
 
 [[package]]
 name = "docstring-parser"
@@ -1404,7 +1406,7 @@ description = "HTTP/2-based RPC framework"
 optional = true
 python-versions = ">=3.9"
 groups = ["main"]
-markers = "(extra == \"crewai\" or extra == \"all\" or extra == \"otel\") and python_version <= \"3.13\" or extra == \"otel\" or extra == \"all\""
+markers = "python_version <= \"3.13\" and (extra == \"crewai\" or extra == \"all\")"
 files = [
     {file = "grpcio-1.74.0-cp310-cp310-linux_armv7l.whl", hash = "sha256:85bd5cdf4ed7b2d6438871adf6afff9af7096486fcf51818a81b77ef4dd30907"},
     {file = "grpcio-1.74.0-cp310-cp310-macosx_11_0_universal2.whl", hash = "sha256:68c8ebcca945efff9d86d8d6d7bfb0841cf0071024417e2d7f45c5e46b5b08eb"},
@@ -1462,6 +1464,74 @@ files = [
 [package.extras]
 protobuf = ["grpcio-tools (>=1.74.0)"]
 
+[[package]]
+name = "grpcio"
+version = "1.81.1"
+description = "HTTP/2-based RPC framework"
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "(extra == \"crewai\" or extra == \"all\" or extra == \"otel\") and python_version <= \"3.13\" or extra == \"otel\" or extra == \"all\""
+files = [
+    {file = "grpcio-1.81.1-cp310-cp310-linux_armv7l.whl", hash = "sha256:6f9a0c9c1cc15c112d1c053064fd032b64917062292c3d70aea280e02ae10b77"},
+    {file = "grpcio-1.81.1-cp310-cp310-macosx_11_0_universal2.whl", hash = "sha256:69ef28e54fc85397f91b8c19592b8ef3d81952080366914823bd8572a2958120"},
+    {file = "grpcio-1.81.1-cp310-cp310-manylinux2014_aarch64.manylinux_2_17_aarch64.whl", hash = "sha256:15641444eca4a29358107b3dceb74c1c6305c55c822fd199b458aaea4068a7fb"},
+    {file = "grpcio-1.81.1-cp310-cp310-manylinux2014_i686.manylinux_2_17_i686.whl", hash = "sha256:d4b2dddfc219f54f956ccd53cf76a1d338ffe68fc7f2849ec9c7feb9927ff692"},
+    {file = "grpcio-1.81.1-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.whl", hash = "sha256:ca1cc11d82677b9662082e5478b7528e2b7db7beaa6bdff42bd62789d81be399"},
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 [package.extras]
 brotli = ["brotli (==1.0.9) ; os_name != \"nt\" and python_version < \"3\" and platform_python_implementation == \"CPython\"", "brotli (>=1.0.9) ; python_version >= \"3\" and platform_python_implementation == \"CPython\"", "brotlicffi (>=0.8.0) ; (os_name != \"nt\" or python_version >= \"3\") and platform_python_implementation != \"CPython\"", "brotlipy (>=0.6.0) ; os_name == \"nt\" and python_version < \"3\""]
@@ -5611,11 +5692,11 @@ description = "HTTP library with thread-safe connection pooling, file post, and
 optional = false
 python-versions = ">=3.9"
 groups = ["main", "test"]
-markers = "platform_python_implementation != \"PyPy\""
 files = [
     {file = "urllib3-2.5.0-py3-none-any.whl", hash = "sha256:e6b01673c0fa6a13e374b50871808eb3bf7046c4b125b216f6bf1cc604cff0dc"},
     {file = "urllib3-2.5.0.tar.gz", hash = "sha256:3fc47733c7e419d4bc3f6b3dc2b4f890bb743906a30d56ba4a5bfa4bbff92760"},
 ]
+markers = {main = "platform_python_implementation != \"PyPy\" and (extra == \"langchain\" or extra == \"all\" or extra == \"openai\" or extra == \"otel\") or platform_python_implementation != \"PyPy\" and (extra == \"crewai\" or extra == \"all\" or extra == \"langchain\" or extra == \"openai\" or extra == \"otel\") and python_version <= \"3.13\"", test = "platform_python_implementation != \"PyPy\""}
 
 [package.extras]
 brotli = ["brotli (>=1.0.9) ; platform_python_implementation == \"CPython\"", "brotlicffi (>=0.8.0) ; platform_python_implementation != \"CPython\""]
@@ -5654,6 +5735,7 @@ files = [
     {file = "uuid_utils-0.13.0-pp311-pypy311_pp73-manylinux_2_24_x86_64.whl", hash = "sha256:b7ccaa20e24c5f60f41a69ef571ed820737f9b0ade4cbeef56aaa8f80f5aa475"},
     {file = "uuid_utils-0.13.0.tar.gz", hash = "sha256:4c17df6427a9e23a4cd7fb9ee1efb53b8abb078660b9bdb2524ca8595022dfe1"},
 ]
+markers = {main = "extra == \"langchain\" or extra == \"all\""}
 
 [[package]]
 name = "uv"
@@ -5781,8 +5863,8 @@ files = [
 [package.dependencies]
 PyYAML = "*"
 urllib3 = [
-    {version = "<2", markers = "platform_python_implementation == \"PyPy\""},
     {version = "*", markers = "platform_python_implementation != \"PyPy\" and python_version >= \"3.10\""},
+    {version = "<2", markers = "platform_python_implementation == \"PyPy\""},
 ]
 wrapt = "*"
 yarl = "*"
@@ -6552,6 +6634,7 @@ files = [
     {file = "zstandard-0.23.0-cp39-cp39-win_amd64.whl", hash = "sha256:f8346bfa098532bc1fb6c7ef06783e969d87a99dd1d2a5a18a892c1d7a643c58"},
     {file = "zstandard-0.23.0.tar.gz", hash = "sha256:b2d8c62d08e7255f68f7a740bae85b3c9b8e5466baa9cbf7f57f1cde0ac6bc09"},
 ]
+markers = {main = "extra == \"langchain\" or extra == \"all\""}
 
 [package.dependencies]
 cffi = {version = ">=1.11", markers = "platform_python_implementation == \"PyPy\""}
@@ -6560,14 +6643,14 @@ cffi = {version = ">=1.11", markers = "platform_python_implementation == \"PyPy\
 cffi = ["cffi (>=1.11)"]
 
 [extras]
-all = ["crewai", "langchain", "langchain-core", "litellm", "openai", "openai-agents", "opentelemetry-api", "opentelemetry-exporter-otlp", "opentelemetry-sdk", "packaging", "starlette"]
+all = ["crewai", "grpcio", "langchain", "langchain-core", "litellm", "openai", "openai-agents", "opentelemetry-api", "opentelemetry-exporter-otlp", "opentelemetry-sdk", "packaging", "starlette"]
 crewai = ["crewai", "litellm"]
 langchain = ["langchain", "langchain-core"]
 middleware = ["starlette"]
 openai = ["openai", "openai-agents", "packaging"]
-otel = ["opentelemetry-api", "opentelemetry-exporter-otlp", "opentelemetry-sdk"]
+otel = ["grpcio", "opentelemetry-api", "opentelemetry-exporter-otlp", "opentelemetry-sdk"]
 
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.10,<3.15"
-content-hash = "e63f12d6124d0c2e9cda7935d20551745a78b68a4de05c872f45a54ede6824f7"
+content-hash = "1546a6ef1f5e5adcccb5539279c40cfdd09b2e201412bc49c9dba94295631cd1"
diff --git a/pyproject.toml b/pyproject.toml
index 708956d7..634c7341 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,8 +16,8 @@ langchain = ["langchain-core", "langchain"]
 openai = ["openai (>=2.8.0,<3.0.0)", "packaging (>=24.2,<25.0)", "openai-agents (>=0.4.0,<1.0.0)"]
 crewai = ["crewai (>=0.152.0,<2.0.0); python_version < '3.14'", "litellm (>=1.83.14,<2.0.0); python_version < '3.14'"]
 middleware = ["starlette"]
-otel = ["opentelemetry-sdk (>=1.38.0,<2.0.0)", "opentelemetry-api (>=1.38.0,<2.0.0)", "opentelemetry-exporter-otlp (>=1.38.0,<2.0.0)"]
-all = ["langchain-core", "langchain", "openai (>=2.8.0,<3.0.0)", "packaging (>=24.2,<25.0)", "openai-agents (>=0.4.0,<1.0.0)", "opentelemetry-sdk (>=1.38.0,<2.0.0)", "opentelemetry-api (>=1.38.0,<2.0.0)", "opentelemetry-exporter-otlp (>=1.38.0,<2.0.0)", "crewai (>=0.152.0,<2.0.0); python_version < '3.14'", "starlette", "litellm (>=1.83.14,<2.0.0); python_version < '3.14'"]
+otel = ["opentelemetry-sdk (>=1.38.0,<2.0.0)", "opentelemetry-api (>=1.38.0,<2.0.0)", "opentelemetry-exporter-otlp (>=1.38.0,<2.0.0)", "grpcio (>=1.80.0,<2.0.0)"]
+all = ["langchain-core", "langchain", "openai (>=2.8.0,<3.0.0)", "packaging (>=24.2,<25.0)", "openai-agents (>=0.4.0,<1.0.0)", "opentelemetry-sdk (>=1.38.0,<2.0.0)", "opentelemetry-api (>=1.38.0,<2.0.0)", "opentelemetry-exporter-otlp (>=1.38.0,<2.0.0)", "grpcio (>=1.80.0,<2.0.0)", "crewai (>=0.152.0,<2.0.0); python_version < '3.14'", "starlette", "litellm (>=1.83.14,<2.0.0); python_version < '3.14'"]
 
 
 
@@ -42,6 +42,10 @@ typing-extensions = { version = ">=4.5.0" }
 opentelemetry-sdk = { version = "^1.38.0", optional = true }
 opentelemetry-api = { version = "^1.38.0", optional = true }
 opentelemetry-exporter-otlp = { version = "^1.38.0", optional = true }
+# Explicit lower bound ensures pre-built cp314 wheels are available (1.80.0+).
+# Without this, resolvers could pick grpcio<1.80.0 which has no cp314 wheels,
+# forcing source compilation (~20 min) on Python 3.14 CI runners.
+grpcio = { version = ">=1.80.0,<2.0.0", optional = true }
 
 [tool.poetry.group.test.dependencies]
 pytest = "^8.4.0"
@@ -78,7 +82,7 @@ pythonpath = ["./src/"]
 # Note: Some env vars are also set in conftest.py for pytest-xdist compatibility
 # on Python 3.14+. This section remains for documentation and older Python support.
 env = [
-    "GALILEO_CONSOLE_URL=http://localtest:8088",
+    "GALILEO_CONSOLE_URL=http://fake.test:8088",
     "GALILEO_API_KEY=api-1234567890",
     "GALILEO_PROJECT=test-project",
     "GALILEO_LOG_STREAM=test-log-stream",
diff --git a/tests/conftest.py b/tests/conftest.py
index 9e92abee..8fc176f1 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -22,11 +22,20 @@
 )
 from openai.types.responses.response_usage import InputTokensDetails, OutputTokensDetails
 
-_os.environ["GALILEO_CONSOLE_URL"] = "http://localtest:8088"
+_os.environ["GALILEO_CONSOLE_URL"] = "http://fake.test:8088"
 _os.environ["GALILEO_API_KEY"] = "api-1234567890"
 _os.environ["GALILEO_PROJECT"] = "test-project"
 _os.environ["GALILEO_LOG_STREAM"] = "test-log-stream"
 _os.environ["OPENAI_API_KEY"] = "sk-test"
+# PROBE (investigation branch): optionally force the selector event loop so we can
+# A/B it against the Windows default ProactorEventLoop. Must run before any asyncio
+# object (incl. galileo_core's EventLoopThreadPool) is created.
+if _os.environ.get("PROBE_EVENT_LOOP") == "selector":
+    import asyncio as _asyncio
+    import sys as _sys
+
+    if _sys.platform == "win32" and hasattr(_asyncio, "WindowsSelectorEventLoopPolicy"):
+        _asyncio.set_event_loop_policy(_asyncio.WindowsSelectorEventLoopPolicy())
 del _os  # Clean up temporary import
 # fmt: on
 
@@ -43,8 +52,10 @@
 import logging  # noqa: E402
 import sys  # noqa: E402
 from collections.abc import Callable, Generator  # noqa: E402
+from contextlib import contextmanager  # noqa: E402
 from io import StringIO  # noqa: E402
 from pathlib import Path  # noqa: E402
+from typing import Any  # noqa: E402
 from unittest.mock import AsyncMock, MagicMock, patch  # noqa: E402
 from uuid import uuid4  # noqa: E402
 
@@ -58,6 +69,7 @@
 from galileo.resources.models.messages_list_item import MessagesListItem  # noqa: E402
 from galileo_core.constants.request_method import RequestMethod  # noqa: E402
 from galileo_core.constants.routes import Routes as CoreRoutes  # noqa: E402
+from galileo_core.helpers.api_client import ApiClient  # noqa: E402
 from galileo_core.schemas.core.user import User  # noqa: E402
 from galileo_core.schemas.core.user_role import UserRole  # noqa: E402
 from galileo_core.schemas.protect.rule import Rule, RuleOperator  # noqa: E402
@@ -115,6 +127,41 @@ def reset_agent_control_bridge_state() -> Generator[None, None, None]:
         bridge_module._PREVIOUS_TRACE_CONTEXT_PROVIDER = None
 
 
+def _fast_validation_payload(endpoint: Any) -> dict:
+    """Canned response for the 3 config-validation endpoints."""
+    ep = str(endpoint)
+    if "login" in ep or "token" in ep:
+        return {"access_token": "secret_jwt_token"}
+    if "current_user" in ep:
+        return User.model_validate({"id": uuid4(), "email": "user@example.com", "role": UserRole.user}).model_dump(
+            mode="json"
+        )
+    return {"status": "ok"}
+
+
+@contextmanager
+def _fast_config_validation() -> Generator[None, None, None]:
+    """HYBIM-790: building GalileoPythonConfig runs 3 async validation requests
+    (healthcheck/login/current_user) through galileo_core's async_run /
+    EventLoopThreadPool, whose Windows IOCP poll is ~11x slower on Python 3.11+
+    (see .local/HYBIM-790-investigation.md). They are already mocked, so they add
+    no coverage — only event-loop cost. Replace them with canned, await-free
+    results so the dispatch is trivial. Scoped to the per-test config build only;
+    test bodies still exercise the real validation/connect code."""
+
+    async def _stub_make_request(request_method: Any, base_url: str, endpoint: Any, **kwargs: Any) -> dict:
+        return _fast_validation_payload(endpoint)
+
+    def _stub_request(self: Any, request_method: Any, path: Any = None, **kwargs: Any) -> dict:
+        return _fast_validation_payload(path)
+
+    with (
+        patch.object(ApiClient, "make_request", staticmethod(_stub_make_request)),
+        patch.object(ApiClient, "request", _stub_request),
+    ):
+        yield
+
+
 @pytest.fixture(autouse=True)
 def set_validated_config(
     mock_healthcheck: None, mock_login_api_key: None, mock_get_current_user: None, mock_decode_jwt: MagicMock
@@ -125,8 +172,10 @@ def set_validated_config(
     if GalileoPythonConfig._instance is not None:
         GalileoPythonConfig._instance.reset()
     # Initialize config with EXPLICIT values to avoid env var timing issues with pytest-xdist
-    # This ensures correct config even if env vars weren't set before module imports
-    config = GalileoPythonConfig.get(console_url="http://localtest:8088", api_key="api-1234567890")
+    # This ensures correct config even if env vars weren't set before module imports.
+    # HYBIM-790: bypass the slow async validation round-trips for the build only.
+    with _fast_config_validation():
+        config = GalileoPythonConfig.get(console_url="http://fake.test:8088", api_key="api-1234567890")
     yield
     config.reset()
 
@@ -553,3 +602,48 @@ def mock_collaborator() -> MagicMock:
     mock_collab.last_name = "Collaborator"
     mock_collab.permissions = []
     return mock_collab
+
+
+# ---------------------------------------------------------------------------
+# TIMING INSTRUMENTATION (investigation branch ci/windows-timing-probe).
+# Localizes the ~1s/test silent overhead on Windows by attributing wall time to
+# setup / call / teardown phases, with live timestamped lines for slow phases
+# and a per-phase aggregate at the end. xdist-safe: pytest replays worker
+# reports through pytest_runtest_logreport on the controller. Remove before any
+# merge — this is diagnostic only.
+# ---------------------------------------------------------------------------
+_PHASE_DURATIONS: dict[str, list[tuple[float, str]]] = {"setup": [], "call": [], "teardown": []}
+
+
+def _probe_ts() -> str:
+    return datetime.datetime.now().strftime("%H:%M:%S.%f")[:-3]
+
+
+def pytest_runtest_logreport(report) -> None:
+    when = getattr(report, "when", None)
+    if when not in _PHASE_DURATIONS:
+        return
+    dur = getattr(report, "duration", 0.0) or 0.0
+    _PHASE_DURATIONS[when].append((dur, report.nodeid))
+    # Live line for anything slow, timestamped so we can see WHEN in the run the
+    # cost accrues and correlate with anything else interleaved in the log.
+    if dur >= 0.25:
+        print(f"[PHASE {_probe_ts()}] {when:8s} {dur:7.3f}s {report.nodeid}", flush=True)
+
+
+def pytest_terminal_summary(terminalreporter, exitstatus, config) -> None:
+    print(f"\n[PHASE {_probe_ts()}] ==================== TIMING SUMMARY ====================", flush=True)
+    grand = 0.0
+    for phase in ("setup", "call", "teardown"):
+        durs = _PHASE_DURATIONS[phase]
+        total = sum(d for d, _ in durs)
+        grand += total
+        n = len(durs)
+        avg = (total / n * 1000) if n else 0.0
+        print(f"  {phase:8s} total={total:9.1f}s  count={n:5d}  avg={avg:8.2f}ms", flush=True)
+    print(f"  {'GRAND':8s} total={grand:9.1f}s", flush=True)
+    for phase in ("setup", "call", "teardown"):
+        print(f"  --- slowest {phase} phases ---", flush=True)
+        for dur, nodeid in sorted(_PHASE_DURATIONS[phase], reverse=True)[:10]:
+            print(f"      {dur:7.3f}s {nodeid}", flush=True)
+    print("  ========================================================", flush=True)
diff --git a/tests/test_experiments.py b/tests/test_experiments.py
index bb4af895..7129cf19 100644
--- a/tests/test_experiments.py
+++ b/tests/test_experiments.py
@@ -674,7 +674,7 @@ def test_run_experiment_without_metrics(
             prompt_settings=ANY,
         )
 
-    @pytest.mark.parametrize("console_url", ["http://localtest:8088", "http://localtest:8088/"])
+    @pytest.mark.parametrize("console_url", ["http://fake.test:8088", "http://fake.test:8088/"])
     @travel(datetime(2012, 1, 1), tick=False)
     @patch.object(galileo.datasets.Datasets, "get")
     @patch.object(galileo.jobs.Jobs, "create")
diff --git a/tests/test_prompts_global.py b/tests/test_prompts_global.py
index af0089f5..3ca5716f 100644
--- a/tests/test_prompts_global.py
+++ b/tests/test_prompts_global.py
@@ -62,12 +62,12 @@ class TestGlobalPromptTemplates:
     def test_create_global_prompt(self, respx_mock: MockRouter, prompt_template_response):
         """Test creating a global prompt template."""
         # Mock the query API (for uniqueness check)
-        query_route = respx_mock.post("http://localtest:8088/templates/query").mock(
+        query_route = respx_mock.post("http://fake.test:8088/templates/query").mock(
             return_value=httpx.Response(200, json={"templates": []})
         )
 
         # Mock the create API
-        create_route = respx_mock.post("http://localtest:8088/templates").mock(
+        create_route = respx_mock.post("http://fake.test:8088/templates").mock(
             return_value=httpx.Response(200, json=prompt_template_response)
         )
 
@@ -80,7 +80,7 @@ def test_create_global_prompt(self, respx_mock: MockRouter, prompt_template_resp
 
     def test_get_global_prompt_by_id(self, respx_mock: MockRouter, prompt_template_response):
         """Test retrieving a global prompt template by ID."""
-        get_route = respx_mock.get(f"http://localtest:8088/templates/{prompt_template_response['id']}").mock(
+        get_route = respx_mock.get(f"http://fake.test:8088/templates/{prompt_template_response['id']}").mock(
             return_value=httpx.Response(200, json=prompt_template_response)
         )
 
@@ -92,7 +92,7 @@ def test_get_global_prompt_by_id(self, respx_mock: MockRouter, prompt_template_r
 
     def test_get_global_prompt_by_name(self, respx_mock: MockRouter, prompt_template_response):
         """Test retrieving a global prompt template by name."""
-        query_route = respx_mock.post("http://localtest:8088/templates/query").mock(
+        query_route = respx_mock.post("http://fake.test:8088/templates/query").mock(
             return_value=httpx.Response(
                 200, json={"templates": [prompt_template_response], "next_starting_token": None}
             )
@@ -106,7 +106,7 @@ def test_get_global_prompt_by_name(self, respx_mock: MockRouter, prompt_template
 
     def test_list_global_prompts(self, respx_mock: MockRouter, prompt_template_response):
         """Test listing global prompt templates."""
-        query_route = respx_mock.post("http://localtest:8088/templates/query").mock(
+        query_route = respx_mock.post("http://fake.test:8088/templates/query").mock(
             return_value=httpx.Response(
                 200, json={"templates": [prompt_template_response], "next_starting_token": None}
             )
@@ -120,7 +120,7 @@ def test_list_global_prompts(self, respx_mock: MockRouter, prompt_template_respo
 
     def test_delete_global_prompt_by_id(self, respx_mock: MockRouter):
         """Test deleting a global prompt template by ID."""
-        delete_route = respx_mock.delete("http://localtest:8088/templates/template-id-123").mock(
+        delete_route = respx_mock.delete("http://fake.test:8088/templates/template-id-123").mock(
             return_value=httpx.Response(200, json={"message": "Template deleted successfully"})
         )
 
@@ -131,14 +131,14 @@ def test_delete_global_prompt_by_id(self, respx_mock: MockRouter):
     def test_delete_global_prompt_by_name(self, respx_mock: MockRouter, prompt_template_response):
         """Test deleting a global prompt template by name."""
         # Mock query to find template by name
-        query_route = respx_mock.post("http://localtest:8088/templates/query").mock(
+        query_route = respx_mock.post("http://fake.test:8088/templates/query").mock(
             return_value=httpx.Response(
                 200, json={"templates": [prompt_template_response], "next_starting_token": None}
             )
         )
 
         # Mock delete
-        delete_route = respx_mock.delete(f"http://localtest:8088/templates/{prompt_template_response['id']}").mock(
+        delete_route = respx_mock.delete(f"http://fake.test:8088/templates/{prompt_template_response['id']}").mock(
             return_value=httpx.Response(200, json={"message": "Template deleted successfully"})
         )
 
@@ -151,13 +151,13 @@ def test_create_prompt_with_unique_name(self, respx_mock: MockRouter, prompt_tem
         """Test that duplicate names get auto-incremented."""
         # Mock query to find existing template
         existing_template = {**prompt_template_response, "name": "test-template"}
-        query_route = respx_mock.post("http://localtest:8088/templates/query").mock(
+        query_route = respx_mock.post("http://fake.test:8088/templates/query").mock(
             return_value=httpx.Response(200, json={"templates": [existing_template], "next_starting_token": None})
         )
 
         # Mock create with new unique name
         new_template = {**prompt_template_response, "name": "test-template (1)"}
-        create_route = respx_mock.post("http://localtest:8088/templates").mock(
+        create_route = respx_mock.post("http://fake.test:8088/templates").mock(
             return_value=httpx.Response(200, json=new_template)
         )