Trying to make usable a 2006 Dell Laptop by using SSD with Ubuntu.
Responsiveness, acceptable, went to check the usage, and as expected near to 0% of CPU waits with I/O,
Then noticed that one of the cores was pretty busy with compiz, so killing 50% of the performance just for eye candy does not look right.
After some googling found this Bug report , and a effective workaround in comment #13 from Marco Trevisan:
to disable some of the unity effects when not running on sw-renderer, is to run unity with:
COMPIZ_CONFIG_PROFILE=ubuntu UNITY_LOW_GFX_MODE=1 compiz --replace
Nice now back to as responsive as computers these days, which once again proves that for regular home PC use, processor of a decade ago is still good, so PoC completed and confirmed if you are going to upgrade your system, put your money on the slugish component: Disk I/O
You would likely need massive CPU horse power if you are doing video rendering, complex math calculations, Big Data or Analytics, and then probably a PC is not what you need.