Alternatives to kwin?

Hi list, are there any real alternatives to kwin when using plasma/KDE? That piece of ***** really drives me away from plasma more and more. It has always been a PITA that, e.g. when running some SDL1 game in ful screen, it went shuffling ALL windows in ALL desktops wildly around and not restoring positions when resolution is changed back. Now it also starts RESIZING them. Got an idea what that means on a work machine with a 5k screen and 6 virtual desktops? Has anyone used openbox with KDE? Is it usable?