If you are facing performance issues then it may be resultant of overlarge PST file. To avoid corruption & boost in speed, You must review your PST file size on time to time. If your PST file becomes overlarge then split it in to small manageable files.
I have used a splitter tool to split large PST file in manageable files.
To download demo of this software, Click at : http://download.stellaroutlooktools.com/StellarPhoenixPSTFileSplitter-Soho.exe
Keep Up with TechRepublic