Thanks a lot! Yeah, sadly I ran out of time (and honestly, knowledge too :D ) to figure out why the WebGL build runs so poorly. I'll take another look at it in a few days because it's bothering me a lot as well.
The Windows build runs fine on all the machines I tested, so I think it's probably an issue with the shader on WebGL.
Glad to hear it didn't bother you too much, though! :)