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Lite Cache is a small cache plugin ultra efficient. It's small and lite because it does only onw thing: caching.

Lite Cache is compatible with gzip compression and handles it automatically.

Lite Cache con detect mobile devices and use a different theme for them creating a separate cache.

Lite Cache works even with commenters, people who left a comment in the past. Other caching plugin usually are not able to serve cached content to commenters (but there could be not already found issues).

Usage of .htaccess rules is possible using the code generated inside the administrative panel (but pay attention that a too much complex .htaccess seems to slow down more than serving cached pages via PHP).

Install it and go to the options panel to find how to configure it.

Lite Cache official page: http://www.satollo.net/plugins/lite-cache

Lite Cache official forum: http://www.satollo.net/forums/forum/lite-cache