I want to amend my previous statement:
Event tags are missing in Cam OG’s microSD recording playback timeline, as demonstrated in this topic:
I don’t know exactly when those disappeared, but I think it’s probably app related.
It happens, I guess. I’ve probably been accused of worse! 
No apology is necessary! My experience with this current production version of the app feels zippier, like I’m not having some of the live stream loading lag I was noticing previously.
The way my favorites page is currently set up, I’ve taken a cue from @Omgitstony, so I have the Video Doorbell v2 top center and then four camera groups on the left. I get the “Loading Livestream…” message for the doorbell for a few seconds when I open the app, and I would estimate ~1-3 seconds or so per group (1-3 cameras per group) when I tap to open those. I don’t have any objective data, but it feels about the same as the previous v3x app in group view and maybe a little quicker and more reliable when I then tap on an individual camera to load its Live Stream page.
Well, that’s just not true at all! Not for me, anyway. I’ve had this current avatar for several…uh…days, and I assure you that I’ve changed 
on a regular and socially acceptable schedule within that time frame. 