Re: The Sims 3 lag after multiple tries of fixing

@PepsyQ  I'm glad to hear that, and yes, StoryProgression is definitely a resource hog.  That's why I mentioned not adding it back right away.  But you can probably use it if you let it run on one of the slowest speeds (slow or snail), perhaps in addition to lengthening the cycle of the skill manager, which is the most demanding among them.  The overall speed is under SP > General Options > Adjust Speed; each manager's speed can be adjusted further as well, for example SP > General Options > Options:Skills > Speed.  The speed is listed in sim-minutes, and a longer interval means a lower impact overall.

Having more residents means more sims to push around, meaning more work for SP and a higher impact on performance.  Homeless sims can also advance a little here and there, especially if they're chosen as coworkers for your active sims, but they have less impact per sim since they spend so much time off the map.  Their cumulative impact can still be high though.  And adding more SP modules will also raise the demands the mod places on the game, so it's best to only add those whose features you need or really want.

You may still see lag when an SP manager is running, but that will happen less often at slower speeds, of course, and the overall impact will be smaller with fewer sims to impact.  You can also disable certain functions, for example I don't allow my sims to move on their own and have home inspections disabled, so SP doesn't concern itself with figuring out whether each and every household should be living somewhere else.

Point is, with some tweaking, you can set up SP to work well for you.  And you can import your settings to new saves as well—exporting and importing mod settings are of Overwatch—so you'd really only need to go through the initial setup process once.

Or you could skip SP entirely.  It's certainly not necessary to enjoy the game, even if it does make things more interesting for a lot of us.