I would defiantly use Overwatch, since it gets rid of all the excess cars, that Sims get which naturally slows down peoples' games. No need to uninstall error trap if you decide to go with overwatch! Are you on a laptop, or desktop? Sometimes, laptops can overheat more easily, even with simple tasks like Facebook, or Twitter.
If you are not judgemental about mods, I believe Twallans Errortrap and Overwatch should work.
Well, technically, even a responsible mod user (even the creator of that specific mod), has to have
some sort of responsible judgement. I mean, you have to make sure the mod is compatible with the base game patch, for one, and two, be sure the mod isn't conflicting with any other mod you download. Also, putting a mod, that will add mature content and functions in the mix isn't really a smart move when young children will be playing your modified TS3 game.