Hi Karsten, thanks for testing it on Linux. What video driver and version of wine are you using?

Extruding is probably a timing problem related to the extruded result getting continuously canceled when you move the mouse, it's on my list to investigate.

Selection might be harder to do anything about if its just texture readback to the CPU that's slow.

Do you notice anything that looks like a sort of delayed reaction like the display is lagging one frame behind what is supposed to be shown?

- Michael