Information Technology Blog - Galido.net

Does your system slow down after running several applications? These registry settings are worth a try:

Go to registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems

Change the Windows key and find the "ShareSection" part in the middle. Change the middle number from 3072 to 8192. This increases the default heap size a desktop window gets. Apps and windows get sluggish when the low default setting of 3MB is reached.

Value should look something like this:
%SystemRoot%\system32\csrss.exe ObjectDirectory=\Windows SharedSection=1024,8192,512 Windows=Ons SubSystemType=Windows ServerDll=basesrv,1 ServerDll=winsrv:UserServerDllInitialization,3 ServerDll=winsrv:ConServerDllInitialization,2 ProfileControl=Off MaxRequestThreads=16

Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows

Change GDIProcessHandldQuote and USERProcessHandleQuote from 10000 to 12000 or 15000. Make sure you change the decimal value. This increases the number of nadles a process can use. Graphic intensive apps use a lot of handles.