You can easily adjust the caustic intensity by adding

lightmap*=0.5;

in the shader code before line 153.

You can also remove the caustic effect completely and improve the framerate by removing


float4 lightmap;

lightmap = tex2D(sLightMap, 0.5*vecSkill41.w*OffsetTex+(vecTime.w/300))* tex2D(sHeightMap2, IN.Tex);

lightmap *= tex2D(sLightMap, 0.5*vecSkill41.w*OffsetTex-(vecTime.w/200))* tex2D(sHeightMap2, IN.Tex);

from the shader code and changing line 154 to

(0.4*color)+