How can I remove Lion? Since the upgrade, my 2011 iMac is painfully slow :(

Any help is sincerely appreciated. My iMac is my primary computer at work and is slowing me down. It ran Snow Leopard beautifully, but it just can't handle Lion. It's a 2011 27 inch model.
Cheers
Jeremy

I updated last week and have had severely degraded performance ever since. It takes around 15 seconds to load launch pad, then even longer for the app icons to appear. If iTunes is playing, playback stutters constantly and it takes a long time for the next song to come on. It's a new machine so there's not much to index, I only have 1 folder with some photoshop files and an iTunes music folder. The only non-standard software I have is Microsoft Office 2008 and Adobe Photoshop CS5.

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