Feature Request: Built-in doctor to alert site owner about issues slowing down their site

[renzms]

It would be nice for Comet Cache to have a built-in doctor that is capable of alerting a site owner about issues that are potentially slowing down their site; i.e., inform site owners about things we are unable to resolve automatically, but that would result in speed increases if they are able to tweak something manually.

An example might be the use of multiple domain names; i.e., the use of domain sharding, which is now frowned upon: https://developers.google.com/speed/pagespeed/service/ShardResources