For some reason when playing in studio or in game no matter what graphics level, it only loads parts in a certain radius around the player, which is irritating, very irritating. I thought this could initially be a problem on my end but it seems to be on by default on any new game I make, and has had an effect on parts made after a certain time in previously existing games.
Below is a comparison screenshot to studio editing and in-game.
Found a solution, if you completely delete studio and reinstall it fresh this bug gets fixed. Seems to be an issue with streaming being stuck on enabled.