Most performance comments are from people running on far, far weaker hardware in emulation these days than 10-15 years ago, where most of us were on PCs only. It's becoming more dominated by mobile based CPUs.
There is not a single game here (of those that boot) where I get any slowdown whatsoever on my PC, and I have a rather budget Ryzen 5600 / RTX 3060 setup.
Play! needs improvements in a lot of areas, sure, but optimization for speed is only something that is needed for very weak systems.