Most of them. An implementation would have to go out of its way to make itself perform poorly if it is built on top of, say, .NET 8.
Have you heard of Ryujinx? Or Nethermind? Or Garnet? Or have you seen that .NET's Regex engine, written in pure C#, is the third fastest in the world after Intel's Hyperscan and Rust's Regex crate?
We are only just now wrapping up the conversion at work to .NET 8 from 4.8, so it will be interesting to see the performance numbers once that is complete.
Our .NET application has millions of lines of code, so JIT compilation time in particular in the old .NET could be very painful.
The difference between 4.8 and 8 can easily be tenfold, depending on the workload and bottlenecks (if it's a slow DB query - EF Core might compile it to a more efficient variant in, say, EFC 8, but if it's linear scan - not much can be done).