I'm just paraphrasing Delroth. There are big improvements JIT could get which no-one has implemented yet, such as macroblocks, where each piece of code JIT'd is bigger, so more optimisations can be applied etc.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT