@electroaudio - Well, noone have ever told it does not do process reprioritization. However the way it does it is a mist for speedpatch author. For those who made the effort to read what cgroups do and how they work it is clear - all processes are put in root cgroup, throwing all what Nokia have done in the trash.

You really may want to read the thread linked a few posts bellow, you can find much more details there. I did my best there to explain what batterypatch/speedpatch do and why one should not use them.