NTFS generates an 8.3 alias for each LFN for all versions of NTFS including NT, Windows 2000, and XP. This autogeneration takes time and if one is not going to use 16-bit DOS or win3.x applications without LFN support, these names are not needed. This can give a decent boost in IO performance. To disable:

Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Control\FileSystem\
Name: NtfsDisable8dot3NameCreation
Type: REG_WORD
Value: 1 Disable automatic alias
Value: 0 Enable automatic alias

NTFS Tips:

Managing Shared Resources and Resource Security
Choosing Between FAT and NTFS
Web versus NTFS Permissions
Getting the Most from IIS Security
NTFS Security, Part 2: Implementing NTFS Special Permissions on Your Web Site
Getting the Most from IIS Security
NTFS Permissions
Cancel an NTFS conversion
NT equivalents of NetWare Rights
Access NTFS from DOS, Win95 or Win98 using NTFSDOS driver
NTFS Last Access TimeStamp
xcopy - keep attributes
How To Remove Files with Reserved Names such as LPT1 or PRN
NTFS Metadata files
Disable NTs 8.3 aliases for LFNs under NTFS
Streams displays which NTFS files have alternate streams content
VolumeID changes NT and FAT volume IDs
Create a NTFS partition over 4GB during installation
Windows NT NTFS Directory Compression