WinCache, or the Windows Cache Extension for PHP, is a PHP accelerator that is used to significantly increase the speed of PHP applications running on Windows Server IIS. Besides increasing the speed of PHP applications, WinCache decreases CPU usage making it a win win situation extension. I’ve described how to run PHP with WinCache on IIS in an earlier post.
Tune & optimize WordPress and your servers to run as efficiently as possible. These articles provide a broad overview of WordPress optimization with specific recommended approaches