From this thread:
There is a thread with some Dorico benchmarks here. I had a 5950x build for several years, first with 64GB then eventually 128, but recently sold it off for parts. On the 1000 bar condensing test described in that thread, I had the following times:
Enabling condensing: 3857 ms
Disabling condensing: 3649 ms
(For reference, my M3 MacBook Pro with 36GB is substantially faster: Enabling condensing: 2681 ms, Disabling condensing: 2074 ms)
If you’re looking to replace your 5600x with a 5950x because you can keep the same mobo, RAM, etc, I doubt you are going to see much improvement with Dorico use. CPU Benchmark rates the single thread performance of the 5600 at 3451 and the 5950x at 3469 so not much improvement to be had there. If you really want to improve performance with Dorico, I would look at that single thread benchmark list and get the fastest your budget allows, even if that means waiting until you have funds for a new mobo.