diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3f9632f42a..52c30378ec 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -185,10 +185,12 @@ jobs:
           azure-credentials: ${{ secrets.AZURE_ACI_CREDENTIALS }}
           tag: ServiceControl
       - name: Run tests
-        uses: Particular/run-tests-action@v1.9.0
+        uses: Particular/run-tests-action@1c9082d0d2c9b07de57656ab138ba75914ad303a # parallel-auto-and-timing-order, temporary
         with:
           projects: ${{ steps.select.outputs.test-projects }}
           max-parallel: ${{ matrix.max-parallel || 1 }}
+          # Experiment: these share one database server, so starting the slowest assemblies together may slow them all down.
+          cache-timings: ${{ !contains(fromJSON('["SqlServer", "PostgreSql"]'), matrix.test-category) }}
         env:
           ServiceControl_TESTS_FILTER: ${{ matrix.test-category }}
           PARTICULARSOFTWARE_LICENSE: ${{ secrets.LICENSETEXT }}
diff --git a/.github/workflows/cloud-database-tests.yml b/.github/workflows/cloud-database-tests.yml
index db780d16e4..7aa7f8e502 100644
--- a/.github/workflows/cloud-database-tests.yml
+++ b/.github/workflows/cloud-database-tests.yml
@@ -136,10 +136,12 @@ jobs:
       - name: Wait for build
         wait: build
       - name: Run tests
-        uses: Particular/run-tests-action@v1.9.0
+        uses: Particular/run-tests-action@1c9082d0d2c9b07de57656ab138ba75914ad303a # parallel-auto-and-timing-order, temporary
         with:
           projects: ${{ env.PERSISTENCE_PROJECT }};${{ env.ACCEPTANCE_PROJECT }};${{ env.AUDIT_PERSISTENCE_PROJECT }};${{ env.AUDIT_ACCEPTANCE_PROJECT }}
           max-parallel: 2
+          # Targets using the same provider run the same projects, so the project list alone cannot tell their durations apart.
+          timings-cache-key: ${{ matrix.target }}
         env:
           ServiceControl_TESTS_FILTER: ${{ matrix.provider }}
           PARTICULARSOFTWARE_LICENSE: ${{ secrets.LICENSETEXT }}