The cpu while in a world was around 90% I just didn't screenshot it
PC specs:
GTX 675m
OpenGL 2.1
Intel i5 3rd Gen 2 core
OSX 10.8 (Mountain Lion)
Sample 1: Bootstrap
Sample 2: Start screen
Sample 3: Loading a world
Sample 4: CPU "Spiking" in game
Sample 5: CPU Crash after closing Sigma...