Does exactly what you hope!

We’re using the plugin on a site that gets upward of 1 million page views/month, and it keeps things running smoothly. There’s a not-insignificant learning curve (making WP fast is, by nature, a complicated task!), but once you figure out the settings that work best for your site, it’s set-and-forget.

Bonus points for including asset minification & concatenation in the plugin itself—most other plugins *either* do minfication/concatenation *or* page caching, but clearly if you’re concerned about site speed, you want both.