Why does my Sims 3 game keep lagging so much?

Could be lots of reasons why. Did it start doing that when you installed Seasons? That expansion is really taxing on your system.

Delete your mods and custom content and try again. Start a new save file and see if it works better. Saves can get corrupted.

Maybe it's bad content or an out of date mod.

It could be because your computer can't handle such high graphics. I know i've had this predicament happen to me.

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