I tried the HD all option from ch 1000 and agree with you, performance is horrible. Looks like it downloads the entire list before displaying a page and then if you select a program and go back it downloads the entire list again, not a user friendly way to do it. Guess I never noticed that since I always go to a channel and then list from there.
I typically search or go to the channel looking for what I want.
While fios and Comcast menus are snappier, neither (to my knowledge) has a complete list like channel 1000 on DirecTV. Finding stuff on their systems is just as painful because the organization for all of them suck.
It is faster if I go to a specific channel but still clunky and I still have to start a recording, go back to the list and wait.... Better but still not even close to the speed of watching something OnDmand with Comcast. I'm no fan of Comcast but I can see why many Comcast subs don't see the need for a DVR at all.
I guess it just isn't for me.