If you have too many fonts installed on your system you may experience slow downs during system start. The main reason for this is that Windows is loading each and every installed font on system startup. If you have installed lots of extra fonts, for instance by installing a font pack with hundreds or even thousands of fonts, or by installing a software that did that automatically, you have probably noticed that the Windows start has slowed down after the installation.
This is especially of an issue if these fonts were installed in error or automatically by a program which you did not really want in first place.
While you could try and uninstall the fonts the convention way, either by uninstalling the font pack or the program that installed them, it may not always be that easy. What if you want to keep the program for instance but not the fonts? Some programs let you uninstall parts of it, while others do not really let you do that.
Enter Font Frenzy, a program that adds several font management options to the Windows operating system. One of the most interesting options of the program is the ability to create a snapshot of all installed fonts on the system.

This can be useful right after installation or on first start of the operating system. Create a snapshot of all fonts then, and restore that snapshot at a later time. More often than not you probably want an automated way of dealing with too many fonts on a system. You can use the program’s Defrenzy option on XP or Vista to remove all fonts from the system that have not been installed by the operating system during installation. There is no word if this is working under Windows 7 or newer versions of Windows as well, and I would be really cautious about running that function on those systems.
A far better option in this regard is the unload and store option of the font manager. It allows you to unload fonts that you do not longer need, but instead of deleting them outright, it moves them to a backup location where you can restore them at a later point in time if necessary.
Font Frenzy is a great little program for Windows users, especially running XP or Vista. It would be great if the author would add full support for Windows 7 and 8 to the program to make it compatible with those operating systems as well.