1. Visit diep.io 2. Open Activity Monitor, Resources view. 3. Observe that only one thread is maxed out at a time and rendering is very slow This is despite the number of rendering threads being set to >1 (automatically set on WebKitGTK 2.41.5) and other websites being able to use multiple threads at once.
Fixed with Skia (WebKitGTK 2.45.x)