Recently in the last week I downloaded compilations from graphicall.org for WindowsXP and cheleb:ppa from linux.
No matter’s if I execute blender from Windows or Ubuntu, blender 2.57x runs really slow on BGE.
I have a crap videocard but work fine for that I do. (Intel 915G)
Old versions of the SVN run just fine. I notice the problem from the last week to today.