CMS sites - Reseller hosting with Hostgator super slow
I have a reseller plan with Hostgator and I am running some CMS sites as well as other sites. I have about 15 sites altogether. CMS sites are Wordpress, Drupal and Prestashop and they are all very slow. Any thoughts on better hosting for CMS sites. I still want to keep my costs relatively low. Also, would moving a single site to a separate shared hosting plan make any difference?