1] What's your blog UR? 2] Check if there is garbage code inserted in header / footer. View source of a rendered page in browser 3] Download, install - Better Delete Revisions plugin and perform a clean up & also optimize database. 4] If still persist.. try and disable plugins one-by-one to see what's causing it
I use: Wordpress plugins: Clean Options Mass delete unused tags WP clean fix for having a clean and fast Wordpress blog, so try this, they will help you
A link to the site you're having the problem with would help us to help you. (On your "3 ways" site, there's a ton of code that doesn't do anything. That's one way to bloat your storage.)