Will OS X Mountain Lion slow down or crash my MacBook Air "13?

Hi
I just downloaded OS X Mountain Lion and I am hesitant to install it... Here are some reasons why
1. My MacBook Air will crash during the installation
2. It will dramaticly slow down my notebook (CPU)
Thanks if you can answer my question.
P.S. I have to 2GB of memory (RAM)

It won't slow it down over Lion. Likely be faster, but you would be better off with 4GB or more RAM.

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