Is there a good reason why I shouldn't pass "mitigations=off" to my kernel and get a two-digit percent performance win? personal laptop, single user. is there any remotely plausible attack scenario?
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If you're not using Chromium, which browser mitigations are going to make a real difference? Google put the most work into other forms of mitigations and their conclusion was that it wasn't workable: v8.dev/blog/spectre. They use those when site isolation is disabled.