Why is Lion so slow?  Everything takes 2-3X as long as before and iTunes won't play most of my movies.

Got Lion.  Now, opening a movie with Quicktime takes 10 seconds, opening ANY application takes twice as long as before, and iTunes won't play most of my movies that used to play in previous versions of iTunes.  I'm frustrated.  Even the web is markedly slower with pages taking 5-6 seconds to load up (and they are simple pages sans videos).
What gives?  Any solutions?  Anyone having similar issues?
The ONLY thing that took less time was Disk Utility...it ran in 4 minutes when it used to take 7--8 minutes.

Lion is much more demanding on memory.  It is almost unusable on my computers that have 2 gig of memory. On the macbook air I am typing this from, it is using 1.5 Gig of memory out of 2 gig. Anything like playing a movie is going to be quite compromised.  SL used about 400 MB for normal low-demand operations.  The memory is soldered on in this laptop, so I am screwed, but it is fairly cheap and easy to add memory to most others.  OWC is a good place to look.  Max it out.  I think your iMac can take 6 GB.

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