Lion is extremely slow instead of Snow Leopard

Before of all, I'm sorry for my bad english, and I hope you'll understand me.
I have a MacBook Pro early 2011, 15" 2,3 Ghz Intel Core i7 4Gb Ram DDR3 with Snow Leopard integrated.
I Upgraded to OS X Lion but my MacBook Pro was very slow, so I done all those things:
Complete format (Osx extended). OS X Lion installation without recover from backup. Reset PRAM.
Nothing to do, instead of Snow Leopard my mac is terribly SLOW, on all application, all program, to see a mail, and on startup we don't have to talk: is slow, and at the end the screen show a blue screen for a second or two, and then it boot normal.
I tried to format again, but Snow Leopard was so faster than Lion. What I supposed to do? I've lost my money buying a bad operative system that transform my MacBook Pro super expansive in a low cost MacBook of the past years?

I'd do two things:
1) Use Activity Monitor to investigate whether there's something using excess CPU time.
2) Use the Console utility to see if there is something writing a large number of error messages.

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