Massive FPS drop in firefox

[GwilymNewton]

We have a scene which can easily get 30/60 fps in chrome depending on resolution. With firefox its dropping as low as 12.

Using the firefox profiler, it looks like the issue is in the animations:

the function requestAnimationFrame is currently taking around 80-85ms

During periods of fps up jump, requestAnimationFrame seems to drop to around 70ms so it looks like there is a strong correlation.

Looking at the Frame steps duration

It appears there is a large chunk of time unaccounted for.

When I tried to dig deeper, there seems to a lot of time waiting around in Gecko if I am reading it right

[GwilymNewton]

Clearing basically everything out the scene, still leaves it at 16 fps.

[GwilymNewton]

Okay fun, sometimes we get 30fps. Not every often and with some stuff in the scene. I suspect its not linked to any one thing we are doing in the scene,.

[GwilymNewton]

No change when switching to 5-alpha-20

[Deltakosh]

Make sure you have hardware acceleration on
For some reason I cannot see your picture but RequestAnimationFrame is not animations. It is the callback the browser calls on each frame for us to render everything

[Deltakosh]

Also a Playground repro could help