Quote: I get 37 fps on my PC when all the spheres are visible with A7 and 5 fps when I run the same level with A6.31
A6.31 is over 2 years old.. Version 6.5 was released almost 4 months ago, and has pretty much the same rendering speed as your compiled A7 demo (atleast on my system).
Get with the times man!
Nevertheless, the performance increase from 6.4 -> 6.5 is awesome. Makes you wonder what must have been 'wrong' in the 6.4 rendering kernel though..