How about compiling WebKit?
https://techcrunch.com/wp-content/uploads/2020/11/webkit-com...
https://techcrunch.com/wp-content/uploads/2020/11/webkit-com...
What's also hugely impressive is that under better cooling conditions, it's also 25% faster.
None of these numbers capture headlines like 2x sadly, but that's still massively impressive.
https://blogs.gnome.org/mcatanzaro/2018/02/17/on-compiling-w...