You probably use the NTFS file system (see the properties of your C: partition). You can improve performance by making some changes in the following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Filesystem
Change the following registry values, as you wish:
DisableNTFSLastAccessUpdate = 1 (last file access is no longer registered).
NtfsDisable8dot3NameCreation = 1 (no more double filenames: long names and the old 8.3 variant (the 8.3 file notation is used for the older Windows versions).
NtfsMftZoneReservation = 2 (if there are many files on a partition, the master file table (MFT) can get fragmented, with this tweak there will be no more fragmenting of the file master file table (default value = 1, range 1-4).