Sorry for the long absence.
Two things:
1.
THANK YOU, team, for another awesome release.
2. Regarding the dreaded Caller UI lag, for the life of me, I won't take that ”low end device” tripe again; it's simply not true. It's just
bad coding on Google's part. Yes, SGS 1 has less RAM, but the exact same delay is present on all the newer/newest devices. I saw it on SGS 2, 3, 4 and Note 3.
Well, three.
What can we do to minimize the caller UI lag?
First off, keep your number of running apps at a minimum. Facebook is a major culprit, and so are most of the messaging clients (WhatsApp, Chat,
SlimIRC & so on).
Avoid using Hangouts as an SMS app. It's a hog.
Disable/uninstall YouTube, Google Play (remanence), Google Plus, Google Now, Dash Clock and any other crap that wants to ”keep awake” your phone. Oh, also get rid of Greenify and manage your apps via permissions: it's much more effective.
In doing so, I now get my Caller UI faster than my son's SGS 4....
Cheers all!