The game become painfully slow when you get your house full.
And yes, my computer it´s a potato. But if I have the game running with 88 or less characters, the things goes more or less smooth. Some seconds of delay when I press some (not all) buttons, and the end of day it´s slow, but everything it´s fine.
But if I have less that 8 slots free, the game slows a lot to the point of being painful to play. We are talking about 5-10 seconds of delay in each and all interactions with the game.
With a correct coding, makes no sense that you have almost a crash from moving from 88 to 89 characters. Seems almost if it was trying to sort an Array with almost no free space to move the blocks.