The server has to run on port 80 for "Manually add..." to work. This is not the default configuration.
The Elite is not slow. You could try rebooting it. You might have a network connectivity problem. What I see on my Premiere, though, is that the standard HME discovery system really only works properly in the SDUI. In the HDUI, nothing happens when I start the server, and nothing happens when I stop it. In the SDUI, apps appear and disappear immediately (and stay that way when I switch back to the HDUI).
Also, I made some changes recently (currently in the git repository, but not yet in a released version) to add the old-style (non-Zeroconf) beacon system as an option. It probably won't make a difference for you, though (it doesn't for me).
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