You're being a bit disingenuous, it builds in 90 seconds because you build it daily and the vast majority of objects are unchanged and cached by ccache.
A stripped down cold build will literally take 90 seconds without caching on modern hardware.
The overwhelming majority of stuff that is being built is drivers, and most of them probably aren't needed for any specific user, so you can disable quite a lot of stuff.
Fwiw a full build of the fedora kernel config takes around 5-10m for my 12core ryzen 3900x, and it's definitely not the fastest CPU around.
