@A_Higher_Place
Today I managed to get rid of the Lag Issue.
I activated the Auto Sync Function between the Cloud and the PS5 Console.
It was deactivated, I don’t know why it was deactivated but after I activated it AND!!! deleted a bunch of my Replays ( the Storage was completely full, I couldn’t even save my Custom Race Settings and I had just 4 of them saved ) everything slowly started to work again properly.
Everything was lagging beforehand, the Menus, everything took ages to load.
My Car Liveries we’re not shown anymore, no Car Pictures in my Garage nothing.
After a while it all started to load up again, Car Pictures, Liveries everything, and the lag in the Menus and during the Races is completely gone now.
I hope I could help you.