st.deviantart.net is DeviantART's static content load servers. It's used to speed up loads by not having to regenerate things all the time. The issues you're having are probably a result of your ISP having a bad connection, or a server problem on dA's end (though it seems to be limited to you, so it's probably your ISP).
If you're bogging down browsing, get something to block scripts. Don't know about chrome, but you can get one for firefox really easy. You'd be surprised how much faster it runs when it's not loading all this crap you don't really need.