I avoided qtile awhile ago because of performance issues I read about when compared with awesome and xmonad. Anyone know about a change on that front? As someone who spends a lot of time in python I would prefer a python tiling wm, but I cannot find any performance benchmarks with the latest versions of qtile.
What kind of performance benchmarks are you looking for? There used to be some memory leaks in xpyb (the X interface qtile uses), but 1.3.1 addresses most of those I believe.
Other than that, I'm not sure anyone has ever reported any performance problems.