Hence the &quot;insane&quot;, it means 2048x2048 base particles. That&#x27;s over 25 million triangles (or 75 million vertices) per pass, and it&#x27;s done twice (color and shadow mapping). Also the curl noise is pretty expensive, and 2048x2048 is quite a lot of operations. I think the browser locks before being able to allocate all necessary info, and if it does, probably the GPU can&#x27;t keep up. Not everyone&#x27;s card can push that much, but I&#x27;ve seen people getting to 4096!