Bug 1754631 Comment 0 Edit History

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1. Use new profile
2. go to https://keithclark.co.uk/labs/css-fps/nojs/

ER: Demo is not smooth

3.Continuously move the mouse inside the demo

ER: Demo becomes smooth

Thus, it looks like the demo is throttled unless the mouse is continuously moved inside the demo.
Reproduced this on a Feb-2021 build with forced WR enabled. So not a new regression.
1. Use new profile
2. go to https://keithclark.co.uk/labs/css-fps/nojs/

ER: Demo is not smooth

3.Continuously move the mouse inside the demo

ER: Demo becomes smooth

Thus, it looks like the demo is throttled unless the mouse is continuously moved inside the demo.
Reproduced this on a Feb-2021 build with forced WR enabled.  When I use D3D11 ADvanced layers, the demo was just stuttery. 
So not a new regression.

Originally reported here: https://bugzilla.mozilla.org/show_bug.cgi?id=1754336#c12

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