I can't get used to the extremely sloooow epg scrolling. Somebody timed it a while ago and it was 6 times slower, which was my experience. Having nothing in the schedule and doing a factory reset made absolutely no difference. I'm amazed that some people haven't noticed the problem or aren't bothered by it.
Deleting all but 7 channels, and less I guess, speeds it up almost back to normal, move forward a week where the epg is empty right of the timeline and it zooms through. It's as if it's having to re-render the whole epg every time a button is pressed rather than the 7 channels to be displayed.
The good news is bbc3HD now records instead of failing everytime, although the both first programmes of a double series-linked, Dr.Who and Salamander failed for me, the second played fine and I've not been able to replicate it since a factory reset.
My thanks to Humax for sorting the bbcHD recording problems and I'm sure Humax know what was changed to slow the epg down so please revert that bit.