System is Win7 on a dual core 2.1 GHz Athlon II M320, gfx is ATI Mobility Radeon HD 4200, it's a Compaq laptop. Speed overall does not seem to be an issue in 0.5.6 aside from the opening video, but 0.5.7 runs at half-speed at best.
As noted, the opening video acts wierd - it sort of stutters...