My Mac is slow- I see rainbow ball. What can I do?

MacBook Air(late 2008) 1.6GHz, 2GB DDR3 RAM, 120GB HD,
OS X 10.10 (Yosemite)
Machine is running slow- I see rainbow ball when I click an app or try to do something.
Ipadeola John
Nigeria

Download and run Etrecheck. Copy and paste the results into your reply. It's a diagnostic tool that was developed by one of the most respected users here in the ASC to help identify the more obvious culprits.
There's no need to run back to a previous version at this time or buy a new Mac. That's ridiculous.

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As well as what a brody asked :
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There's no reason to think that Mountain Lion will slow down your Mac. Just make a backup of your data before upgrading with Time Machine > http://support.apple.com/kb/HT1427
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When that is happening run this to see what is running and then copy and paste the results here:
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My Mac is slow- I see rainbow ball. What can I do?

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