I'm new to using wp-cache (2.0.17), but giving it a shot just for grins. However... I can't decide if it is actually doing something or not. Or if I have plugins that are killing it or defeating the purpose.
For instance, here's what it adds to my main index page:
<!-- Dynamic Page Served (once) in -1.508 seconds -->
<!-- Cached page served by WP-Cache -->
-1.5 seconds, eh? Wow! Is that normal? Should I be concerned or not?