Has anypne else here had a problem of slow undos in Max 7? Everything else is fast, but the undo is taking ages. Its affecting a few of us here. In the UV editor it can be up to 20 seconds for an undo to complete.
Mine does that sometimes, but it seems to be only when I have DirectX shaders in the viewport. At least, that's the only thing I can find in common with the few files that get a slow undo - most of the time it's perfectly fine.
It is the direct X, but you don't need to be using Direct X materials to get the slow down. Switching to open GL fixes it, but then when I do add spec and bump maps I can't see them. Great.
It seems to be related to the 'Show DX in viewports' flag for standard materials. If this is ticked in the MatEd then it slows down undo to varying degrees, even if the material isn't assigned to any object in the scene. The DX9 Shader doesn't seem to have this problem, so a possible workaround is to save out the FX file…