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FF89/90/91 : Page loading perf Issues

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Hello,

I am generating html based reports I open locally thru file://<path> protocol thru FF89. Pages load at light speed. As they are relatively big (12MB+), with icons and graphs. It takes generally afew secs to load. Upgrading to FF90 and 91(.0.2), same pages take up to 3 minutes to load or even more. Tryed to open page via http server installed locally and same occur.

Auditing FF processes (on Win10x64, I7 8Cores, 24GB Ram, SSD), CPU is at 13%, no IO or very few IOs. FF seems to not be responding and I need to kill processes thru task manager.

I disabled add-on (just Ghostery), drop and recreated new profile but without success. Tryed different settings, Removed smooth control, HW acceleration, ... no way.

Same pages loaded from same laptop using Edge or Chrome are loaded correctly, in time, and does not show so long delays.

Anything that can explain such perf dropdown ?

Thanks

Cheers from Belgium

Th Even FaceBook does time to time freeze (pages not loading imgs anymore or unresponsive buttons). Have to kill FB to resume. This slowness started with FF90 and increased with FF91

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