If you start GNOME help the first time this takes a lot of time. On my system (1.4 Ghz) I am guessing it needs about 30 seconds (and therefore about 6 times slower than Epiphany) – and you do not get any hint if something is happening. I do not know what they are doing that makes it so damn slow, but my suggestion would be to dump Yelp alltogether and use Epiphany by default. With that decision you get a help faster and also have the full featured browser. Maybe give epiphany a start option like epiphany –help-browser to get in a special mode and thats it. The current status is just unbearable. A help must be available very quick – at best instantly. Everything else does not work at all.
Also I would suggest to minimize the offline help and rather link to the web for uptodate help. Maybe as an option allow people to download the online help as a package. Today it does not make much sense to reduce help to just some official offline help. Like in Ubuntu you get the most help that makes sense in wikis rather than the official documentation.
No offenense to the programmers of Yelp. I just dont know why things are that way – and also I am quicker making a google search and getting an answer than waiting till yelp has started.