How do I recover my mac from being so slow?

My mac is running slower and slower, in all kinds of programs. I don't know where to start searching. How do I go about to find the cause of this? Is there a protocol or any programs to run?
Thanks for feedback.
  Modelnaam:          MacBook Pro
  Modelaanduiding:          MacBookPro8,2
  Processornaam:          Intel Core i7
  Processorsnelheid:          2 GHz
  Aantal processors:          1
  Totale aantal cores:          4
  L2-cache (per core):          256 KB
  L3-cache:          6 MB
  Geheugen:          4 GB
  Opstart-ROM-versie:          MBP81.0047.B0E
  SMC-versie (systeem):          1.69f1
  Systeemversie:          Mac OS X 10.6.8 (10K549)
  Kernelversie:          Darwin 10.8.0

Not enough free space on the startup disk can slow your Mac down.
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure you have a minimum of 15% free disk space.
Freeing Up Hard Disk Space - Mac Guides
OmniDisk can tell you which files and folders are taking up the most drive space.
Download OmniDiskSweeper for Mac - Quickly find/delete big, useless files; now free. MacUpdate.com

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