1.Insert your pen-drive. Let your PC read it. Make sure to delete all the stuff on it first.(Minimum 2 GB)
2.Right click on My Computer.Click on Properties from context menu.
3. Click on Advanced tab.
4.Click on Settings under Performance.
5.Click on Advanced tab.
6.Click on Change button under Virtual memory.
7.Select your USB drive.
8.Click on custom size radio button and give the values as follows;
The size depends upon your free memory capacity of your pen drive. So you can change this limit according to your pen drive size.
9.Click on Set button, then click on OK.
10.Now you have to restart the computer with pen-drive inserted. The speed of your computer will be increased.