Performance Related Windows Registry Keys

Performance Related Registry Keys

File System Caching

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management] IoPageLockLimit”=dword:LockLimitValue00000000 The LockLimitValue can be: 4096000 for a system with 32MB RAM 8192000 for 64MB RAM 16384000 for 128MB RAM 65536000 for 256MB RAM

Change to increases file performance.

Configuring contiguous file allocation size

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem] “ContigFileAllocSize”=dword:00000200

Including this option increases performance.

Increase NT Performance by disabling the last access time stamp

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem] Disabled “NtfsDisableLastAccessUpdate”=dword:00000000

Enabled “NtfsDisableLastAccessUpdate”=dword:00000001

Directory Replication properties

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Replicator\Parameters] “Interval”=dword:Number of minutes between checks. Default is 5 minutes “GuardTime”=dword:Number of minutes the export directory must be stable before it is replicated.

The default is 2 minutes. Max value is half of the above Interval

Disabling the OS/2 subsystem to increase performance

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager] Disabled “GlobalFlag”=dword:20100000

Enabled “GlobalFlag”=dword:00000001

Parse AUTOEXEC.BAT file

[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] Disabled “ParseAutoexec”=”0”

Enabled “ParseAutoexec”=”1”

Hard disk free space warning

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters] “DiskSpaceThreshold”=dword:Threshold percentage.

This value should be converted to hex.

Run 16-bit apps in separate VMs.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WOW] Disabled “DefaultSeparateVDM”=”No”

Enabled “DefaultSeparateVDM”=”Yes”

Optimizing the L2 cache

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management]

“SecondLevelDataCache”=dword:Amount of installed L2 cache in KB (should be converted to Hex)

Unable to Connect More Than 10 Clients

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters]

“Users”=dword:ffffffff

Increase free connections

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters] “MaxFreeConnections”=dword:default value is between 2 and 4.

Set to 8 for best performance.

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