[2023] Low fps problem

I can only imagine Eco isn't doing well with your pretty special CPU, given Eco doesn't make use a lot of multiple cores but prefers single core focused cpus and has no optimization for such CPUs.

What typically tends to help in such weird edge cases is trying the next update of Eco that changes Unity version, The next one does with a fix for 4090's, but the next major Unity upgrade is still a while to go.