Phoronix has actual benchmarks: https://www.phoronix.com/review/amd-ryzen-9950x-9900x/2

It's not 3x, but it's most certainly above 1.3x. Average for compilation seems to be around 1.7-1.8x.

Oh, fair enough -- you are correct compared to 5950x. I was mentally comparing my personal experience with 7950x. Yes 1.7-1.9x seems fair for a bump from 5950x to 9950x (albeit at a higher power draw).