3DS Max slowdown when Undoing

[Cthogua]

I'm having this weird issue where Max essentially freezes for a second or two when I undo something. It doesn't seem make any difference what or how heavy the mesh. I can pull the side of a box out then hit undo and it still takes a second or two. The rest of Max runs butter smooth. My undo buffer is set to 50, but I've had it set to 200 before and never had this problem. Anyone know what might be the issue?

[shape]

are you using a DX shader? I remember that being an annoying issue back when I was using max.

[Cthogua]

AH HA! I wasn't using on in the scene, but there was one in the material editor from something I had imported then applied a regular material to. It seems they slow things down even when they're not being "used." Thanks a ton man.