Important: If you are on an iPad or M1/M1 Pro/M1 Max device, you can ignore all this and .
On Safari 14.1 (which you seem to use), WebGL apps – including Shadowmap – experience significant performance issues. The easiest solution is to upgrade your device to macOS 12 (Monterey) or switch to another browser. You can also upgrade to Safari ≥ V15.0 and make sure to enable the following settings: