Some of the performance enhancements in Windows 7 are:

• Windows SuperFetch: This feature tracks application utilization and ensures that the most commonly used programs are kept in physical memory rather than being swapped out to disk.
• Low-priority I/O: This feature allows some disk access to be designated as low priority.
• Windows ReadyBoost: This feature allows you to use a flash memory in a USB flash drive to boost Windows 7 performance.
• Windows ReadyDrive: This feature allows Windows 7 to use flash memory embedded directly in hard disks.
• Automatic defragmentation: The vast majority of users would not remember to defragment the hard disk in their computer. This is now performed automatically without user intervention.