tansqrx is right about setting a fixed sized to a swap file, there are performance enchancement that can be achieved by doing so. However to take full advantage of performance gains that can be achieved... I would follow this procedure.
1) Run Disk Cleanup
2) Run a Full Scandisk and automatically repair any problems found
3) Run a Full Defrag even if the computer say the drive doesn't need
4) Then configure a fixed swapfile.
The above procedure will assure that there will be no fragmentation in your swap file, which will turn increase the speed of access to information contained within.
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