DrakeMegrimfrknMy overlay only works if I have -dxlevel xx in my launch options. If I don't, the names are all very thick/blurred. Shift+tab doesnt work if I have the -dxlevel xx command. Halp
Open Task Manager, Click on "Show processes from all users", find "mumble.exe*32", right click on it, and Set Priority to Low. It's rather annoying and you'll have to do this every time you start mumble.
You don't have to do this over and over again if you use Prio ( http://www.prnwatch.com/prio/ )