The site can do that once in a while on me. When it does it to me, (being slow) clear your browser in the control panal.
A really nice program that will clean/clear/fix internet issues is CCCleaner. It will become a left-click option on your trash can. This program is excellent in getting internet "sluggishness" and other issues handled well.
Google CCCleaner, download from the legit source from the program creators, and just follow what it says to install.
I "run" it every other day or so, and it keeps the 'net running smooth. It has other features as well, but the interface will guide you through everything.
Hope it helps.