I'm the anon that made the secret and it's been the same for me. While I do experience glitches and bugs within the game, it's never been anything game breaking. I've been playing the same save file for three years. Any performance issues such as frame rate drops, are the same between both computers and I can fix these issues by myself. Removing excess townies, purging ghosts and deleting cache files is all I need to do. The game should do this by itself but it doesn't.

It makes me wonder how many people have bought new computers to play TS4 because they thought it was a hardware issue when it's an issue with the game itself and it happens regardless of how powerful the computer is.