He's amazing and reading his blog the other day prompted me to update my already kinda recent Emacs (I last build it in february 2022) to the latest master release.
I haven't found out why yet but apparently Emacs now compiles faster too. On my 3700X / 32 GB of RAM I now get, using make -j 16 bootstrap 1m30s for the non native-compilation and 2m30s for the native-compilation version (which is the one I use). That's down from about 4 minutes six months ago on the same machine: I think something changed that makes compilation faster.
Yep, that was Lars' doing as well. He ran like 1 years worth of Emacs builds on every commit to see where the big jumps occurred, dug down and fixed regressions. There were other people helping too, but I remember Lars being the driving force behind the endeavor.
I haven't found out why yet but apparently Emacs now compiles faster too. On my 3700X / 32 GB of RAM I now get, using make -j 16 bootstrap 1m30s for the non native-compilation and 2m30s for the native-compilation version (which is the one I use). That's down from about 4 minutes six months ago on the same machine: I think something changed that makes compilation faster.