Intel Core 2 Duo iMac became super slow; what do I do?

05-21  Source: Network gathering  Views:86 

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Intel Core 2 Duo early 2008 has become very slow.  What can I do to determine cause and correct problem?
donald from studio city wrote:
Thanks.
Have 1GB RAM.  Will follow up with citation.
Wow, well I'm pretty confident it could benefit from a RAM upgrade. As a general rule of thumb OS X likes 500MB of FREE RAM at all times. Keep Activity Monitor open (Applications - Utilities - Activity Monitor), the next time you notice a slow down check A M and click the System Memory tab. If you see about 500MB or less you would benefit from a RAM upgrade. You can buy RAM from reputable sources like www.macsales.com (OWC) or Crucial. Installing it is a 10 minute process.
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