Greetings - I'm Jerrie from Oregon. I switched to an iMac in 2009 shortly before retiring after 21 years of PC support for a large utility, Sometimes I miss the simplicity of DOS. After 5 years on my iMac I'm having trouble figuring out how to resolve a noticeable decrease in response time. Perhaps it's just tired, but probably the hard drive is cluttered up. Any sage advice from the experts would be appreciated, or just point me to a current thread. Thanks.