5.2 to 5.3 performance hit

So I read some similar comments about performance after porting from 5.2 to 5.3 being bad and how it’s due to screen render in the editor. But it looks like even a standalone game has a performance hit. Even after BUILD the game lost 30+ fps and stat.GPU showing “unaccounted” adding 3.00+ to the frame render time, whereas in 5.2 it’s marginal.
Has anyone figured out what is causing it?

I have checked the settings and all look the same. (even adjusted screen % in the editor to match for sanity check)
Are there settings that don’t port over?

Other posts so far closed without a real resolution.

Also noticed the standalone game load in time massively increased from 5.2 even tho it’s the same drive and the same files.