ANR when open some pdf (building floor plans)

[ava5412]

Hello
subj
Коттон Вей Пр-ЭОМ_АСУ_СС_24.09.25_2Этаж.pdf

[ava5412]

env:
Samsung A54, Android 15
Pixel 8 Pro, Android 15
ComPdf 2.4.7

[ComPDF-Youna]

Hello @ava5412 , I'm very sorry for the late reply. We have reproduced the issue and will fix it as soon as possible.

[xiaolongrick]

Hello subj Коттон Вей Пр-ЭОМ_АСУ_СС_24.09.25_2Этаж.pdf

Hello @ava5412 , we have tested this file. Each page contains a large number of high-resolution images, which causes slow page rendering. The time required to complete rendering varies depending on the device’s performance, and currently there is no quick solution to this issue.

Regarding the ANR (Application Not Responding) problem, it occurs because document.hasChanged() is called on the main thread during the save operation. Since the PDF pages are very large, this operation is time-consuming. We will optimize this in the Tools module. If you are calling related APIs yourself, it is recommended to check whether the document has been modified and perform save operations on a background thread to avoid blocking the main thread.

[artemkhmelev-myoffice]

Hello, @xiaolongrick

The original issue was not about saving, just opening and rendering of some high-resolution (as you mentioned) images.

Moreover, the document is not high-sized itself, only 3-4MB, so it should not cause any problems with saving at all. Some time ago, I made a quick research about ComPDF sdk performance inside our application, and it shown, the problems with saving started with files ~50MB.

Memory consumption when going to edit mode and then trying to save changes:

Memory consumption without going to edit mode

Besides time to render the images, sdk takes some time to close the document and release resources.

I hope this will help you to come up with ideas of further investigation and optiomisation.