[imtringued]

You're describing asm.js which had significant issues as a compilation target. The generated javascript code was massive and it took several seconds just to parse it.

[caseymarquis]

Related is a mozilla post on streaming wasm for big performance gains: https://hacks.mozilla.org/2018/01/making-webassembly-even-fa...

[kllrnohj]

asm.js never added threads, which is a far bigger performance issue than fine-grained manual memory allocation is.