If you are using win+iis7 platform, I highly suggest to use wincache 1.1 (windows cache extension for php)
you can download or install it with windows web platform installer (http://www.iis.net/download/WinCacheForPHP).

The project for zend backend cache file.
http://github.com/juokaz/wincache...

The installation is very simple.
save the wincache.php file:
/concrete/libraries/3rdparty/zend/cache/backend/wincache.php

and place this:
define('CACHE_LIBRARY', 'wincache');
in config/site.php

attachment: wincache.php (little modified)

(Does not work with wincache 1.0)

more information php.net/wincache

enjoy! :)