Windows XP contains an interesting function, called Prefetch, capable of reducing applications startup time as well as the operating system boot time.

Prefetching works this way: the first time the user runs a given X application, Windows controls its startup and creates a X.pf file inside the Windows/Prefetch folder. This file contains a sort of index of the X application files to load into memory, as well as information about the order in which they should be loaded. That way, the next time the X application is started, Windows will check the previously created "index" and will use its information to grant a faster startup time.

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