Full of resources .. but its not easy to find the best configuration

This is probably the fastest cache plugin I have tested.
But, to achieve the best configuration possible, it is necessary to spend many hours of hard work.

For example, if you are selecting one or more options on “Browser Cache” section, it is advisable to check the impact of your choices in the performance, with a benchmarking tool (for example, ApacheBench). In my case, I discovery that checking all of them (as suggested in many forums) causes a degrade in the performance. The worst option of all, in terms of performance lack, was setting “expires header”. So, it is important to set only the options that you really need.

By not having a protection against these traps in which a beginner can fall, I prefer to evaluate it as a four star.
But, if you really know what you are doing, and you have the conditions to test the results of your choices, this is certainly the best option for you.