How to Delete Temp files and Cache on MBP 15" Late 2011

Hi,
Off late i am experiencing a lag in my mac and it runs bit slowly. Wanted to get a clear picture on how to clear the unwanted temp files and cache to make my mac run smoothly. Any other suggestions to make it run fast are welcome and would be of great help.
Regards,

The assumption that unwanted temp files and cache are causing poor performance is unjustified. OS X does not maintain unwanted cache files. They exist to increase performance and are updated or deleted as necessary. So are temporary files. Certain font cache files are moved to the Trash during Safe Boot: OS X: What is Safe Boot, Safe Mode? - Apple Support. Do not use any other utility.
If your Mac is running slowly, determine if the same symptoms occur in Safe Mode.
Back up your Mac if you have not done so already. To learn how to use Time Machine read Mac Basics: Time Machine backs up your Mac - Apple Support.

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