一直以來為這個問題困擾的人相信有不少。剛剛在其它論壇上看到有人在抱怨(-->LINK<--)

後面有人跟帖支援了：
"Id be willing to bet you have the exact problem I did. Its a buildup of abandoned cars around town, probably about 900 of them. Search Nraas Overwatch, download it, and set it to clear out the cars (you can do it immediately as well). Cleared mine up right away and Deletes 30-60 cars every night. Another EA perk."

就是說EA沒有做好清理工作，每天在城鎮緩存裡留下一堆車……如此日積月累當然到一定天數就撐不住啦 = = 所以才會有人反映說重新開襠就沒問題，玩久後就開始頓卡

解決方法是用twallan的Overwatch，
鏈接：http://ts3.tscexchange.com/index.php?topic=4685.0
裝好mod之後在遊戲裡選擇"Cleanup Vehicles"，應該會改善很多 :)

BTW那個Overwatch裡面還有很多其它cleanup functions, 時不時可以用一下。

Credits to twallan~