I've been working on a Minecraft project using Three.js, but I've run into some performance issues specifically when rendering shadows.
If you'd like to check out the demo, you can find it here:
You'll notice that the FPS drops below 30 and continues to decrease the longer you stay on the page. It's quite odd because rendering shadows at this scale should be relatively easy for the GPU, don't you think?
In line with Don's observation, it appears that you are continuously generating new meshes and materials within the render loop.
Specifically focusing on how the sky is being created.
The primary issue seems to arise when a new material is created using a map (canvas generated every frame), which is then uploaded to the GPU (refer to the attached screenshot from Chrome devtools).
To address these issues, consider implementing the following solutions:
Chrome Devtools Screenshot: https://i.sstatic.net/JgAVD.png
EDIT:
Check out this sample sky shader code for more insights.
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