dye44 on twitch.tv has a map of 1.1 Million sims on a res only map. It seems likely he can go much higher then that.
He also has a map that has a 'taxi-splosion' one taxi spawns hundreds of taxi's until all the streets are deadlocked with taxi's. He has to log off and back on for the map to work again.
Lastly are the insane, inane, and wacky workarounds he does to have a playable game. EA got too ambitious and couldn't manage all the WTF's they have made with the new engine.
He also has a map that has a 'taxi-splosion' one taxi spawns hundreds of taxi's until all the streets are deadlocked with taxi's. He has to log off and back on for the map to work again.
Lastly are the insane, inane, and wacky workarounds he does to have a playable game. EA got too ambitious and couldn't manage all the WTF's they have made with the new engine.