this post was submitted on 05 Feb 2024
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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..
What of those are unsafe?
https://github.com/Alex313031/Mercury/blob/main/mozconfigs/mozconfig
Everything involving
-O3. That usually stands for "enable all standards-compliant compiler optimisations, no matter how how little their benefit or their stability".What would be even worse would be
-Ofastwhich won't even care about strict standards compliance. No sane distributor distributes-Ofastand the only distributor I'd trust to use-O3correctly is Intel's Clear Linux.I don't know about
OPT_LEVELbut it's likely an abstraction of the build system for this flag.Interesting. Thanks!