> Function calls from WASM to JS don't seem to have improved so much. Yeah, Wasm => JS calls used to be reasonably fast because we had optimized that before. T

> Function calls from WASM to JS don't seem to have improved so much. Yeah, Wasm => JS calls used to be reasonably fast because we had optimized that before. The work described here made that path much nicer, though (a more unified stack layout for JIT/Wasm frames) and also a bit faster still. JS => Wasm calls being slow was one of the big performance cliffs in SpiderMonkey and I'm really glad that's fixed now.