This isn't GPU intensive at all, but there's a lot of software and CPU overhead in WebGL compared to native OpenGL. This depends on your browser, the WebGL back

This isn't GPU intensive at all, but there's a lot of software and CPU overhead in WebGL compared to native OpenGL. This depends on your browser, the WebGL backend it uses (that would be Angle+Direct3D if you're on Chrome on Windows) and your CPU. I got 24 fps with my high end GPU (and bad stuttering) with an old, poor CPU on Linux + Firefox. GPU is practically idle, but CPU is at 100% and fans are yelling.