House Robbery Drop in Frames

Description: When I enter a house to rob, I instantly drop to about 20 fps and it is very difficult to attempt a hack. Once I get past a hack and I am walking around a house, my frames stay low and once in a while go back to super smooth. I tried messing around with settings in the house but could find nothing that improved my framerate in the house. Everywhere else in city is super smooth.

What setting should I change for this?