have you done any benchmarks to compare wasm performance with js? i have been doing some benchmark test cases after a large refactor of my game engine written in typescript that is built entirely on top of shared buffer arrays (using ECS pattern or so it’s called i guess). i’m done benching for a while now and am ok with results but i have also compared my handcrafted quadtree sort/query algorithm with off the shelf rust implementation that matched the test requirements and saw only 30% gain and figured anything lower than that would not be worth the effort assuming rust compiled to wasm is same or slower and never bothered to test compiled wasm because i could not figure out how to share my buffer arrays with the rust code using wasm bindgen fast enough to bother spending more time on more benching lol
Nothing rigorous at all, no. I did do a lot of practical tests, as a way to compare what I had been doing to what was planned to be done, but I've found js is plenty performant for the types of CPU work I needed done, which is the big benefit of WASM.
Since I've mostly focused on rendering, there's just not much that really should be done on the CPU side. But I do have plans to extend my renderer to have a CPU pipeline which doesn't rely on WebGPU or WebGL, and I imagine I'll be doing quite a bit of benchmarking there. Forcing the CPU to render is going to make js choke - it's just a matter of how much it takes. I imagine any forward rendering will be fine, but there's no chance it does path tracing worth a damn. So somewhere between "textures" and "realtime global illumination" I expect I might have a lot of data about what WASM can do to help in that arena (if anything; though I am expecting it to help quite a bit, especially with stuff like SIMD).
On the other hand, entirely, I have been using the Rapier physics engine since it has a javascript version and as far as I know it heavily utilizes WASM for its physics calculations, so there might be some good benchmarking for WASM benefits surrounding that library.
I had a fun 2 years where I basically had 800 critical lines of math code that had to be on every platform, one version in the native language of the platform, and one version as performance optimal as possible.
I was absolutely stunned to find that on web WASM ~= JS which altogether weren't far off from a naive C++ stdlib port. I had to make custom data structures instead of using stdlib ones to really get performance significantly different . IIRC my most optimized C++ converted to WASM was about 70% the speed of JS.