When you start your computer with more number of fonts the speed of computer reduces. To increase the speed of computer you should decrease the number of fonts but you have to save all the files also.For this best way is to create a new folder and save all the files (which you are not using regularly) in it.
Follow these steps to open a new folder and save the files in it
Right click on desktop
new > folder
Move all files to this folder
Move this folder to my documents so that it is easily accessible.
Restart the computer you will see that your computer is faster than before.
