The problem I described above occurs in RC2. Yesterday I upgraded to SVN build 2211, but the problem is still there. Now I can see the mouse pointer while moving in editor, but typing is terribly slow (cpu usage raise drastically)...
I'm on Linux - Debian Sid, nVidia GF6600GT, latest nVidia drivers from Debian repository, Xorg 6.9 by the way. On Windows everything is fine (I have tried it in vmware). I have the same problem in wyoEditor too.