[Bug 1908082] Re: Ubuntu Firefox is 15% slower than Flatpak Firefox for speedometer benchmark

[Olivier Tilloy]

@Tynach, the symptoms you describe do advocate in favour of the
toolchain/optimizations hypothesis. If upstream builds are not affected,
wherease Ubuntu builds are, when both are run on the same platform,
surely there is a difference in the optimizations used to produce the
binary under test.

That said I've tested your sample shader in shadertoy on Ubuntu 21.04,
and while the framerate is not super constant it does hit 60FPS
regularly (chromium is behaving better, also around 60FPS but with a
much more constant framerate than firefox). That's with the firefox
Ubuntu build, and the chromium snap.

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Title:
  Ubuntu Firefox is 15% slower than Flatpak Firefox for speedometer
  benchmark

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