I've read on their sub reddit that there was a brief down time a few hours ago but its solve now. Try clearing you cache and cookies before accessing the site again.
I wish it could be like that but this issue last for already pretty long time.
It is always like that, long ass slow to get full loading on etherdelta. That's why i hate etherdelta. Check your internet connection first, If you have unstable connection, it might be the problem because in my experience when my connection is unstable, it's really hard to open etherdelta. Must refresh it many times to load it completly.
Maybe it also depends on my internet connection (because I've got a pretty slow one) but it still worked pretty bad.
Once today I had a successfull connection but then it stuck on loading again. Duno why is that happening but it is possible to lose a good moment to sell some tokens.