test ubuntu with its lowlatency kernel too - it is at repos -
As easy as this, and test the both kernels, not only the 100 Hz one.
sudo apt-get install linux-headers-3.2.0-23-lowlatency
sudo apt-get install linux-lowlatency
with the metapackage there are a warning
I installed the metapackage alone at first and I had a warning asking for isntall headers, then I removed it ,and did it this way and there was no warnings, the update-grup is done, twice, as you say, this way, but I do like to be sure all is ok, and i can read the output - and be sure all will be ok when i will reboot.
Poor performance on Intel® 965GM x86/MMX/SSE2
It seems that the poor performance in Ubuntu is caused by this bug: Poor performance on Intel® 965GM x86/MMX/SSE2? If anyone else is experiencing the same issue please go and vote for it as shown here: how to vote (you have to be logged in). Hopefully it will get fixed sooner.