The log in comment #17 shows the delays are/were specifically here:

Feb 03 21:06:04 goetz-Latitude-E7250 gdm-password][1365]: Process exit status: 0
Feb 03 21:06:36 goetz-Latitude-E7250 wpa_supplicant[845]: wlp2s0: WPA: Group 
rekeying completed with e0:28:6d:24:15:dd [GTK=CCMP]
Feb 03 21:08:32 goetz-Latitude-E7250 /usr/lib/gdm3/gdm-x-session[1409]: (II) 
modeset(0): EDID vendor "LGD", prod id 1078

I *think* that means:

Feb 03 21:06:04 User enters password to unlock.
Feb 03 21:06:36 System rejoins wifi network.
Feb 03 21:08:32 Xorg wakes up and redetects the connected monitor.

So the first thing I would try is to disable wifi before sleeping. Does
that then make waking up faster?

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https://bugs.launchpad.net/bugs/1774188

Title:
  Unlocking the  screen takes 5 seconds in Xorg sessions (not so much in
  Wayland sessions)

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