Windows XP uses lots of resource for showing visual items. If you disable some visual effects and styles you can save some system resources. It helps to speed up windows display but your windows may look ugly instead of sexy. To optimize your Display settings on windows Xp follow this steps:
1. Click the Start button and then Select Control Panel

2. Then Double-click the System icon > Click the Advanced tab

3. Then In the Performance box click Settings and Leave only the following options ticked. This is the best settings i used on windows Xp:
Use visual styles on windows and buttons
Use drop shadows for icons labels on the desktop
Show shadows under menus
Show shadows under mouse pointer
Show translucent selection rectangle

4. The last step is, click Apply and OK to use that settings.
Note: plz note that if you don’t like diaabling windows visual styles you can always enable that.

At  First, you need to go to Start, then run.

1. Type in regedit in the box.

2. Then, go to

HKEY_LOCAL_MACHINE\System\CurrentControlSet\VxD\MSTCP

Now, find the string DefaultRcvWindow .

3. Now, edit the number to 64240 then restart your computer. There you go. High speed cable modem now with out dloading a program. Original value is 373360

Note: This tip is for Windows 9x Only. If you want to get regestry settings for Win Xp visit this Page.

Windows Explorer caches DLLs in memory for a period of time after the application an using them has been closed. Which in some cases can be an waste of memory. To stop Windows from always caching these DLL files, create the new registry key below.

Open up the Registry and navigate to :

HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ Explorer

Create a new sub-key named ‘AlwaysUnloadDLL’ and set the default value to equal ’1′ to disable Windows caching the DLL in memory.

Restart Windows for the change to take effect