sames very simple register alloction in JIT

[carltraveler]

is that because of the stack operation mostly converted to memory operation, and few register used?

[twitchyliquid64]

The JIT does not implement any register allocation, and my experiment (in one of the branches on my fork) did not show any performance improvement from implementing it.

I think any improved performance is totally masked by the lack of support for branching in the JIT - it always falls back to interpreting for branching and control flow management.