Comment 7 for bug 1908082

Similarly, I'm seeing better performance for the snap version of firefox than with the deb, on Ubuntu 20.10:

  deb: 85.1 ± 1.4
  snap: 108 ± 1.5

This could very well be explained by the toolchain and default build options used to build each package: the snap is built from an upstream binary, compiled with a very recent toolchain and likely many optimizations turned on, whereas the deb uses the toolchain available in the corresponding Ubuntu series, and often not with full optimizations to work around hardware limitations in the Launchpad build farm or toolchain bugs.

This is not to say that we cannot research turning on more optimizations though.