Sims keep on buffering/freezing

@IrisAlvarezRocas  I would say you can test your old saves now.  Please copy them over, if you did try the clean user folder, and test with no mods or cc; you don't need to worry about missing content because the originals will be intact in their old folder.  If you didn't try the new Sims 4 folder, just make a backup copy of the saves folder inside.

If your old saves still have issues, please move your sims to a different lot in one of the base game worlds and test again.  If you still get freezing, try a different household within that save.  The idea here is to try to isolate the source of the issue: the lot or world, or one or more sims, or the save overall.