I was using CloudFlare for awhile, but realized it was causing a few issues. In practice it sounds like a great idea, essentially the same as any CDN, but free. However, when editing posts on other websites, WordPress was never able to adjust the ajax to format the text in the visual viewer. It wasn’t really that it didn’t render it, it was more that it would take until a timeout is hit to render anything in the body field.
Simply not acceptable. As soon as I deactivated CloudFlare, it worked great. Needless to say, it’s not something I really need, so I just removed it.