I also use Cloudflare. I started researching what to do because my hosting company Sending me emails saying that I had to move up to a more expensive account because I was using too much CPU resources.
My sites get a lot of traffic but that wasn't most of the problem. The biggest problem was the bots.
I did a lot of things including changing to another hosting company which was a lot less expensive and provided me with faster SSD drives and lightspeed. I wrote about everything I did at http://www.top10googleresults.com/speedupwebsite