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Am actually totally digging JS DOS, the emscripten build of the DOSBox emulator. The performance is phenomenal in the browser, including vsync. Here is an example (CPU intensive) of multiple 64k demos running simultaneously on a single web page ;)

https://js-dos.com/6.22/64k/index.html




8 FPS on MacBook2019 and Chrome...


27 to 31 fps on a 2.6 GHz MacBook Pro (Late 2013) in Safari. Try Safari, maybe?


I’m getting 6fps on my iPad Air 2 in safari...




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