I just had the opportunity to compare the lualatex compilation times for a 650 page book on a 3.2 GHz Intel Xeon W from 2017 (iMac Pro) with the same on a new Macbook Pro 16" with M1 Max. I ran both compilations twice. The performance should be a function not only of processor but also of disk speed, but I presume most of it is cached the second time and SSD speed on both is fast. I just used a simple unix time command for the timing.
The Xeon takes about 36 seconds, the Macbook Pro about 20 seconds.