We stumbled upon some performance issues with our WebGL application. With GPU instancing enabled on a shader it will freeze the whole application for 2-5 seconds everytime you move the camera in the scene. This only occurs in the finished WebGL build and not in the editor. Here is a screenshot from the WebGL browser profiler. The saved profiler data is also attached on this post. Some info on my machine and where and with what I reproduced it: Firefox 63.0.3 64Bit Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz, 2901 MHz 32GB Ram NVIDIA Quadro M2200 Unity 2017.4.15f1 Unity 2018.2.9f1 Standard Shader Mobile/Diffuse Shader Custom Shader asm.js WebAssembly The steps to reproduce are: 1. Place a lot of cubes in the scene with the same material 2. Turn on GPU Instancing on the Material 3. Build the WebGL application 4. Rotate or move the camera (I just used a fly controller) Is this a known issue? Should I just file a bug report and wait for an answer through that?