We have this already, it's called Tcl/Tk

It claims to be on par with LuaJIT. Makes me a bit suspicious. How does it achieve this?

FTA (edited to insert the hyperlinks as text): “Cyber is fast on various benchmarks. The language was designed with performance in mind from the start. See more Benchmarks (https://cyberscript.dev/performance.html) or read more about Performance (https://cyberscript.dev/performance.html#info).”

That last link mentions

  - Crafty register VM.
  - Efficient call convention.
  - Inline caching.
  - Compact values.
  - Fast dispatch.
  - Precompiled JIT.
  - Compiled using Zig/LLVM.