I have an N270 netbook I'm testing performance fixes on too. With that hardware I found the best performance (by far) is with:
1. Install ppa:vanvugt/compiz
2. Install ppa:vanvugt/unity
3. Open ccsm and in Workarounds set "Force full screen redraws..." = ON
With any luck, steps 1 & 2 will be built into Ubuntu 12.04. Step 3 is an unknown and requires more testing before it can be made the default. Because full screen redraws only became feasible and improve performance after you have the fixes from the PPAs.
I have an N270 netbook I'm testing performance fixes on too. With that hardware I found the best performance (by far) is with:
1. Install ppa:vanvugt/compiz
2. Install ppa:vanvugt/unity
3. Open ccsm and in Workarounds set "Force full screen redraws..." = ON
With any luck, steps 1 & 2 will be built into Ubuntu 12.04. Step 3 is an unknown and requires more testing before it can be made the default. Because full screen redraws only became feasible and improve performance after you have the fixes from the PPAs.