The width and height are too small ，Increasing width and height can cause serious frame loss

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[jloehr]

That is a known issue. The implementation is pretty straight forward and therefore very inefficient.
A good first optimization step may be to skip all that vertex manipulation in Unity and do that via a proper shader on the GPU.

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Now I need the shader of the water and the magma but I don't know what shader should do

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TerrainShader.zip

That doesn't seem to work. Can you teach me?