said by the crucial forum link :
Correct alignment is critical. Microsoft say an incorrectly aligned SSD can suffer performance loses of up to 50%. If you installed Vista or Windows 7 straight to the SSD and let it make the partition on the SSD for you then your alignment is fine. it's only of concern if you're installing XP or you're restoring a partition image backup as Daz did.
Any comments on the part in bold. How true is it?