Material Tab and thumbnail preview being extremely slow

[maxsoder (Max Söderström)]

I tried to reproduce the problem with the model you gave, but I am unable to do it. I have had two meetings with users and we have identified two cases that can cause the slowness.

Case1: Textures on a server.
Are the textures on a server? Can you test how the performance is if you use textures that are on the local computer. Textures that are on the same computer as Rhino is running on.

Case2: No rendered previews.

Material Dialogue and List

I think there are several factors involved that cause the slowness. I am myself trying to solve these issues for the material panel (not looking at layers panel as others have better knowledge about it) and try to find fixes if possible. As there are probably several factors causing these issues that means it is harder to figure out fixes. I hope to find them one by one and fix them. I have had a meeting with @Iyang_Huang and with @Elias_Brulin and both have problems with slow material editor.…

Maybe this is another case we do not yet know about?

EDIT: I can now reproduce the problem.