In IIS6 on Windows Server 2003, we could recyle the application pool that hosted our SharePoint site in order to force the web application to perform a JIT compile. This would then reload any DLLs it required. This saved a considerable amount of time over an IISRESET.

That command is:

C:\windows\system32\IISApp.vbs /a "SP Site App Pool" /r

(Note that the first time you run IISAPP.vbs, you’ll get a few confirmation prompts.)

This VBS script does not exist in IIS7 on Windows Server 2008, but the good news is there is an even better command:

c:\windows\system32\inetsrv\AppCmd Recycle AppPool "SP Site App Pool"

Type “AppCmd /?” for a list of all the useful actions you might want perform against your IIS7 installation.