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.
On a mobile device, especially on a weak processor, all sites will be extremely slow, of course it is better to use a laptop for these purposes. But you also can not quit it, because it gives you advantages in the form of control and safety.