[nikki93]

Figma uses webassembly. We also use it for our web engine at https://castle.xyz, I gave at talk about that you can watch here: https://youtu.be/0FjCaoc1uzs where I go into some details and also do some live wasm game development (not sure how "serious" since we're still working on our app though).

Much, much better performance than JS is possible because (among many other things) you can perform a lot of optimizations during AOT compilation due to eg. LLVM, avoid GC and arrange memory to help cache efficiency.

Re: JS call overhead, ultimately using instanced drawing so you have a constant number of draw calls even for a growing number of objects is what helps.

[tmountain]

As an aside, castle.xyz looks really cool! I can’t wait to play around with it.

[nikki93]

Thank you! We also have a Discord server (link at bottom of website) -- the app is rough around the edges still and some support / inspiration usually helps.