@AkosLukacs thanks for running those benchmarks - that's really interesting.
I think with some work ESP32 speed could probably be improved a lot (just by making sure a few core functions stayed in RAM) - however even with that, it's going to get destroyed by most other JS engines.
I've been meaning to add a proper JIT interpreter for a while which should give it a huge speed boost, but actually there's been very little demand for it - and even if I did it, it's something I'd probably never get around to porting to Xtensa for ESP8266/32.
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