Open world=Lag
The open world and create a style is part of the reason why sims 3 lagged so much.
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Not optimizing the game and bad coding was the lagging problem in Sims 3. Also creating worlds, homes and those plum horses that didn't route properly was an issue too. I never played Isla Paradiso because the work I would have to put in editing the lots so there wouldn't be any routing problems. Keeping the game as 32-bit didn't go over well either.
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