How Can I Make My iMac Fast Again?

Using Lion my iMac has become slow. I decided to double my memory and it helped...a little. But overall my iMac is much slower than when it was running Snow Leopard. How do I fix this?

you have too many processes running at once according to the picture above of your activity manager. you have only 140.4 MB of ram that are free and 4.64 GB that are inactive. the other 3+ GB of ram are either wired or active. what each of these means is that you are using 3 GB at one time you have  4+ GB that are doing nothing at all and only 1/10th of a GB that is left for new processes and random movements. my suggestion would be to get the iMemory Cleaner app from the mac app store and use it on your system it will clean out your ram cards and give you a fresh start. Another program i recomend is CleanMyMac.

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