Not to sound like an ass, but "looking at a way to speed it up" when every other network in the world is already faster, seems kinda silly.
I mean I love Copeac. But the slow interface has definitely caused me to take my business elsewhere in the past. All things being equal, I might go somewhere else. And although its not gigantic, that potentially a 6 figure monthly business that you might lose from one customer per month.
There really is no excuse for the slowness, imo. You guys have the programmers to make your interface much more attractive, you should have plenty to make it as fast as your competition.
It costs you more business than I think you might realize. If I was you, it would be priority number #1 or close to it.