Will OSX Mountain Lion slow down my computer?

I have an iMac (about 2 years old) and was wondering if OSX Mountain Lion will slow down my computer.
Computer Specs
=================
Processor: 3.6 GHz Intel Core i5 (1 Processor with 2 cores)
Memory 8GB 1333 MHz DDR3
=================
I'm not sure what else could be useful, so tell if there is.
Thank you

Sorry I wasn't sure which to click (Lion or MT Lion) since I was asking about Mountain Lion but had Lion...
Anyway, Thanks

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Hello, sadly the highest OSX it can run is 10.5.8/Leopard.
10.6.x,10.7.x, & 10.8.x will NOT work on any PPC Mac like a G4.
With only 768 MB of RAM I wouldn't advise anything beyond 10.4.11 actually.
Leopard requirements/10.5.x...
    * Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor
minimum system requirements
    * 512MB of memory (I say 1.5GB for PPC at least, 2-3GB minimum for IntelMacs)
    * DVD drive for installation
    * 9GB of available disk space (I say 30GB at least)
Classic/OS9 Apps no longer supported.
Trouble is Apple no longer sells it, check eBay & such for the Retail version, not the Gray Discs...
http://www.ebay.com/sch/i.html?_nkw=mac+os+x+leopard+retail+10.5
You have to call Apple & likely ask for a Product Specialist to get it, if they still have it! Helps to tell them you have an iPad/iPhone & you can't run 10.6.
There are workarounds if the 867MHz CPU is the only hangup...
http://sourceforge.net/projects/leopardassist/
http://lowendmac.com/osx/leopard/unsupported.html
List of Applications Not Compatible with Leopard...
http://guides.macrumors.com/List:Applications_Not_Compatible_with_Leopard
If you don't know the model, find the Serial# & use it on one of these sites, but don't post the Serial# here...
http://www.chipmunk.nl/klantenservice/applemodel.html
http://www.appleserialnumberinfo.com/Desktop/index.php
How to find the serial number of your Apple hardware product...
http://support.apple.com/kb/HT1349

Will OSX Mountain Lion slow down my computer?

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