[6.12.4/5/6] Major GUI delays after upgrade (specially dashboard, docker and apps tab)

Hi, after upgrading from 6.12.3 to 6.12.4 my Webui has been very slow. Special on docker tab and dashboard.

Takes almost 12 sec before the page is visible. I can see my CPU are wokring MUCH more when i try to open DOCKER tab or the Dashboard.
Never seen a behaver like this before. I tried to stop Array, but Dashboard is still slow 12 seconds to open it, normally it tooks 2 seconds.
Tried to remove some plugins, but still the same

EDIT 1:
After removing more plugins and multiple reboots. The issue is till there.

EDIT 2: I decide to revert back to 6.12.3. And guess what, it working normally again, fast like it always was
So can someone please explain me why I had this kind of issue with 6.12.4 ?

EDIT 3: Tested v.6.12.5 RC 1 and the latest version released yesterday, v.6.12.5. It's still the same.
Adding the diagnostics from my backup server (Galactica)