OS X Lion freezes my MacBook Pro

Hello everyone,
I've got a 15' MacBook Pro since November 2010, it came with OS X Snow Leopard, and everything was fine with it. No bugs, no freezing, no problems... I could use it without having to restart the computer for months.
I made the upgrade to Lion in July 2011, and since that day, my MacBook Pro freezes randomly quite often. Sometimes it's when I'm checking my emails for example I click on "answer" and the MacBook Pro freezes, there is this multicolor whirl, I can't do anything. I've to shut down the Mac by holding the power button for a while. It doesn't happen only with mail, it happens randomly like I said. For example, when I'm watching a YouTube video or watching photos in iPhoto... even when I only use the finder to find a file.
To repair this problem, I tried everything :
- I made a clean install of Lion (I thought, maybe some Snow Leopard parts were the problem).
- I made a repair of the permissions, a repair of the disk, well, everything that could help the Mac to work better like PRAM reset, NTFC reset, etc
- I completely erased the disk, and I made a clean install of Lion.
I don't think it's an hardware problem, because everything was fine with Snow Leopard. If you know something I could do in order to have a Mac without bugs and freezing. And don't tell me to reinstall Snow Leopard, cause I really need iCloud.
Thanks in advance

OK everyone, I may have found the solution, with a very clean install, everything seems to work fine now.
What I did: I downloaded Lion to create a USB installer, then I launched it, in disc utility, I erased the disc, and also the empty space (about 2 hours).
With my hard drive all cleaned, I installed Lion using the USB key, (about 20min).
Since, I tried eveything, I opened all my programs, I used YouTube and every websites with Flash. I tried eveything that could make it freeze. Nothing, so I think that's the solution of many freezing problems.
And the Mac seems to be faster than before... So it's strange, cause I already did that before, except the Install from a USB key. Maybe it's that.

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Lion freeze on MacBook Pro 2010

Good morning,
I have had a few freezes since I upgraded my 2010 MacBook Pro (15" Core i5) last Friday. I think it might be related to the graphic card switch but I'm not sure. A few freezes occured while browsing the internet with chrome and I have had two yesterday evening while using iPhoto.
Everytime, the machine was getting really hot during the freeze and I had to hard reboot manually by holding the power button for a few seconds.
Is anybody else having some issues with their 2010 MBP?

Hi guys,
Thanks for your feedback, at least I'm not the only one. I've deactivated the automatic switch of graphic cards (using gfx cardstatus, handy little app by the way) and I didn't get any freeze since.
Another thing, the ambient light sensor doesn't seem to work either. Not a big issue for me but still this is another issue...
I guess we'll have to wait for a patch and see!
Appart from that I have read a lot of complaints concerning CPU load or battery life. Everything is normal on my side, I even got better battery life since I'm under Lion.

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Ah then that is the issue.
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some of the trade off are
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slow wake ups from sleep
slower start up time about 30-40 seconds longer then what you have now
the operating system will use high % of your processer while idealing
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OS X Lion freezes my MacBook Pro

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