Tried a few more games last night, and adding to what I reported earlier in this thread.
Note, won't mention frame rate as I don't know.
I download latest version with all patches before testing.
If I don't mention glitches of any kind, that because I did not see any.
Fallout 4 (PS+ version)- Far Harbor DLC (not included in PS+ version but I own this previously and allows you to include it with PS+ version): because of all the fog, this had slowdowns even on the PS4 Pro, but now it's smooth as butter.
Titanfall 2 (digital version) - tried campaign, and very smooth, but then again it was very smooth on Pro. Have not tried multiplayer yet.
Battlefield 4 (digital version): single player and multiplayer runs great. Never saw any slowdown.
The more I test, the more I'm impressed with the PS5. Really amazing backwards compatibility. I'm always expecting a problem, but then everything runs just fine and really smooth.
Will see if I have time to test another game today.