Mountain Lion and Lion very slow on Macbook 13' 2010 Middle

The problem is the Mountain Lion and Lion very very slow, but Snow Leopard was fast.
The Lion bit faster, the Mountain Lion is much slower.
Animations are choppy and slow, but sometimes fast, but mostly random stuttering. If i have multiple windows opened, the Misson Control is very slow and useless. I think the system UI framerate is low (about 10-15 FPS)
Overall, the system response is very slow, and lagging.
I tried to clean dinstall several times, but this didn't help me.
I know that the new system is slower on older machines, but it would not be so necessary. This Machine is good machine, and i think this is enought for Mountain Lion. Will Apple fix this slow issue soon (maybe 10.8.3), or stay in this state?
At current state of the system is unusable due to the slowness.
Or is it a non official solution to fix this?
Thanks for your answers.

How much RAM do you have installed? 4 GB RAM is generally recommended as a reasonable minimum since kernel_task (part of system) consumes up to 1 GB; my browser consumes another 500 MB or so. So, if you like to multi-task and have several things open, then you will need to increase your RAM. This problem will not be fixed; I sent in a bug report and the reply was that this is how it is intended - 64 bit addressing consumes far more resources than 32 bit (Snow Leopard).
You'll need to look at your processes in Activity Monitor, quit some apps while working on others that are CPU intensive, and increase the RAM if possible.

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    Process:         Preview [3364]
    Path:            /Applications/Preview.app/Contents/MacOS/Preview
    Load Address:    0x102c9a000
    Identifier:      Preview
    Version:         ??? (???)
    Code Type:       X86-64 (Native)
    Parent Process:  launchd [114]
    Date/Time:       2012-04-24 13:28:40.470 -0700
    OS Version:      Mac OS X 10.7.3 (11D50d)
    Report Version:  7
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    6   CoreServicesInternal                    0x00007fff86ef12fb _ZL28createBookmarkWithURLAtDepthPK13__CFAllocatorPK7__CFURLmS4_PK9__CFArrayR19 BookmarkMutableDatajbPP9__CFError + 3230
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