@sLumPia:
Afaik this is a problem with python being compiled on Debian-based armel/hf distros. I've read that it sometimes goes away after recompiling python.
I hope that this problem disappears magically in Wheezy due to the change from the buggy gcc 4.4 (at least on armel/hf) to gcc 4.6.

I've never used Blender, so I have no idea about its performance requirements. But given the brilliant works that are created with Blender I'd expect it to be rather resource hungry.