I've been using Unity for two days... but all the apps and Unity itself runs very slowly I've installed Catalyst 11.4 (Ati Radeon HD 4350, 2GB RAM, Core 2 Duo @1.86 Ghz, 12 Gb Partition, 1 Gb to Swap) and I unchecked the v blank option in OpenGL in CCSM.
There is another way to speed up unity?