Hello I am designing a game and it is already pretty fun to play. Users on good computers report that the game is a lot of fun. although users on older PC's and laptops report the game is lagging and stuttering and the loading times are long. each time they enter a house and when they exit a house loading times are 15-20 seconds. when observing a tester I noticed he tries to avoid entering homes or shops as much as possible to avoid loading times.
The game was made in unity. it is single-player 3D  and plays in a single city with loading zones for each house. If I want to increase the quantity of people having fun in the game what should be done?
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