One question left: The framerate in Indy goes down when the green bar of the CPU-overlook-thingy suddenly moves to the right, what does that stand for? The other bar isn't moving at all, it is quite stable as it seems.
(G)reen = GFX Thread (P)urple = Physics Thread In 930 the bug impacts the physics thread and causes the physics to use 100% of your CPU which then causes framerate drops. If the green bar maxes out but the purple bar isn't then your GPU is probably what is limiting your framerate. In 910 the purple bar shouldn't move much at all, especially on your CPU.