It also slowed down my bootup time by 5-10 secs on the average. It used to be around 45 secs, not it's only sometimes that it will boot up within 45 secs - most of the time it's more like 55.
Also, ever since installing SL I never really experienced the "immediate shut down" speed they boasted about. It was only after the clean install that upon shutting my MBP down/restarting it it would take two or three seconds before it restarted, but later on whenever I pressed "Restart" or "Shut Down", it would at least take like 10-15 secs before it shut down. So where's the speed you claimed, Apple?
Well yeah, if I restart my MBP, then after a couple of mins try it again, that's when it will actually power off within like 5 secs, but if you worked on it for a while, it will always take more than 10secs to shut down. Heh.