To me it's obviously a scam because there's no way such an improvement can be achieved globally with a single post explanation. 90% faster is a micro-benchmark number.
This is neither a micro-benchmark nor a scam, but it is click-bait by not mentioning jq specifically.
Micro-benchmarks would be testing e.g. a single library function or syscall rather than the whole application. This is the whole application, just not one you might care that much for the performance of.
Other applications will of course see different results, but stuff like enabling LTO, tuning THP and picking a suitable allocator are good, universal recommendations.
True that, I mean it is still interesting, that if you have a narrow task, you might achieve some significant speed up from rebuilding them. But this is a very niche application.
true, i saw a thread recently on reddit where guy hand-tuned compilation flags and did pgo profiling for a video encoder app that he uses on video encode farm.
In his case, even a gain of ~20% was significant. It calculated into extra bandwidth to encode a few thousand more video files per year.
