HT204448: About the OS X Mavericks v10.9.2 Update
Learn about About the OS X Mavericks v10.9.2 Update
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Apr 14, 2014 1:31 PM in response to Gaz 54by thomas_r.,I use an anti-virus program and use "Clean my Mac" to remove rubbish from my hard drive
This is probably your problem.
First, CleanMyMac and other such "cleaning" apps are worse than useless. Macs do not require this kind of cleaning, and in fact, it can cause performance problems or even damage the system. See The myth of the dirty Mac.
As for anti-virus software, there's a lot of very bad anti-virus software out there. What software are you using?
For more information on solving performance problems, see my Mac Performance Guide.
(Fair disclosure: My site contains a Donate button, so I may receive compensation for providing links to The Safe Mac. No one is required to donate.)