I can speak for the terminal textures, but the melted carslook like theyre outside the airport, so its most likely slow loading photogrametry. You can clear your cache, or if you dont have a cache just do 5-10gb, i found its a massive help in places (such as LA) with lots of PG.
KBUR v2 - grainy building textures, "melted" cars
in Microsoft Flight Simulator
Posted
Tried. No change.