There's also JCO for creating JS based WebAssembly components. It's based on StarlingMonkey which I believe is slightly faster than QuickJS under web assembly. https://github.com/bytecodealliance/jco

Benchmark numbers for request isolated JS hello world / React page rendering:

    JCO/wasmtime: 314µs / 13ms
    Bun process forking: 1.7ms / 8.2ms
    v8 isolate from snapshot: 0.7ms / 22ms
    TinyKVM: 52µs / 708µs
    Native with reuse 14µs / 640µs

Numbers taken from our upcoming TinyKVM paper. Benchmark setup code for JCO/wasmtime is here: https://github.com/libriscv/kvmserver/tree/main/examples/was...

(I suspect even if we are able to get TinyKVM into a state you'd feel comfortable with in the future it would still be an awkward fit for Datasette since nested virtualisation is not exposed on AWS EC2.)