Claims 7-10% performance improvement on an old AMD FX thing. No information about the baseline though; whether it's the terrible Snap or Firefox's official binary package. I suspect it's the former because it has known performance issues IIRC and the latter has quite good compiler optimisations already (LTO+PGO making most of the difference).

When I built Firefox for x86_64-v3, I saw no measurable improvement over x86_64-v1 in speedometer. I didn't dare to build the most security critical application on my system with unsafe compiler optimisations though..

After the shenanigans with that dev and his other project, Thorium. No fucking thanks.

just make sure to download one of the newer versions without the furry porn

It is based off ESR but the flags are really cool!

You can build Firefox yourself, takes like 30min on a modern Laptop.

I did that to remove the jemalloc memory allocator, to make it work on Secureblue

Just havent found how to compile regular Releases yet.

Tried this myself, performance differences are non existent. In fact I noticed more regressions on speedometer than improvements.

Don't bother, use Floorp instead.

Been using it, absolutely cannot recommend.

You won't notice any difference whatsoever.

Does this enable x86-64-v4 (AVX512) optimisations? I've checked the github page but don't see any references to x86-64-v4.

Neat.