I have a self-hosted WordPress CMS/Blog on Hostgator; I had Jetpack for a while but eventually had to disable it on the reco of the Hostgator admins because of the resource load on the shared server. I think this is because Jet has to constantly connect to its server. The CPU usage dropped way down after I disabled it. I first implemented all the other optimization techniques reco'ed by Hostgator and use Cloudflare and Supercache. The only thing I really miss is the dashboard info on the stats for each post and page.