I am always annoyed by etherdelta's user interface. It is hard to use usually in mobile device and hard to scroll down especially when buying or selling. Unlike other trading sites have good UI. I can't stop using etherdelta because most of my tokens are only tradable in their slow site.
I suppose, Edeldelta is not well compatible with mobile device browsers. And a lot of congestion occurs unexpectedly. If your needs are diverse and move more and more commercially via mobile. please pay attention to Huobi.pro. It is working pretty well and effective for me.