Also some things are wayyy slower on v8 compared to other engines. (I've only checked spidermonkey.) In my experience v8 is faster at running WASM and spidermon

Also some things are wayyy slower on v8 compared to other engines. (I've only checked spidermonkey.) In my experience v8 is faster at running WASM and spidermonkey is faster at running optimized js (not quite asm.js but using some tricks like |0) and starting workers.