I'll check again, but I definitely remember it popping up pretty much as soon as I pressed the use key. No, it is popping up as the same tic or nearly the same tic that a use command is registered. Nothing else is bound to my use key, even though that shouldn't matter. Definitely did not use the old code of HD past, waiting for 1-2 seconds while holding use to make it appear.
The new HUD (well, for me, being frozen in Doom time for a little over a year) looks quite nice, in particular the memory aspect of the HUD with simplified, player colored graphics. It suits HD quite well. One question though, would be if you could add the armor indicator and the weapon status memory indicator to the automap HUD, so that it shows everything, as lacking these two things is a bit odd for the nearly completely detailed automap HUD. I'd also suggest taking either the normal or fullscreen HUD and spreading the HUD elements a bit further away from the center of the screen, as it feels a bit congested having both HUDs do this. But that's just my take on it.
Other than that, this is playing quite well! The little downward view shift when you jump/mantle, the heartbeat sounds and heartrate functionality, and the ridiculous full auto pistol (well, I guess it would be more of a machine pistol, but w/e). I've only seen a few of these new (to me) changes, I can't imagine what else you've done. Great work!
Edit: One last thing...is it just on my end, or are the HD crosshairs around
3-4 times bigger than they were in the past? I mean they got comically huge. And there seems to be no way to scale them in game as they are separate from GZ's crosshair system.