> Read Performance Issues section in FAQ

I don't see a section named "performance issues" or anything similar in the FAQ.

> That sounds like a configuration/OS issue on your end.

Can you suggest some ways to determine this? I'm not sure what configuration I've changed to cause this.

> How much ...

Running Debian with graphics drivers from nvidia. CPU stays at 800% while in a game. Works fine under Windows on the same machine. 0.14.23 has a similar problem, but limited CPU use to 600%, and is a bit more playable. 0.15 is too slow to play well. GTX 980, i7-5930K.