We have a few upcoming plans to attack this bug. Unfortunately, fixing the bug is very difficult and will take us a lot longer. But to alleviate some pain, we have two more things:
- 1) We want to make sure that the messaging is better. We usually send that message as a blanket "your graphics driver couldn't handle this" (and quite often, it is the drivers). In the case of alt-tabbing, it's probably that your graphics card ran out of memory, and that could be solved by decreasing texture resolution and graphics settings.
- 2) We're implementing an in-game option for borderless windowed mode, which should alleviate the alt-tab time significantly. There's already a way to do this by editting the config file, but an in-game method might alleviate some of the pain.