Visual Setting for Specific Laptop

@Liudmila-tian  The lower fps is likely related to the lag, but it can be difficult to tease out the cause.  Is there anything these episodes have in common, for example do they take place in the same world, or even on the same lot, or is the same event happening, or are there are a lot of sims in the area?  It can even be related to the time of day, for example when the NAP votes are being tallied, and the game has to apply or remove the associated buffs to sims in the neighborhood.  And of course if a mod is doing a lot of work at a specific time, that can also cause a slowdown.

The fps dropping when the game is running is fairly normal, although the size of the drop seems larger than it should be.  But rendering animations on sims wearing a lot of custom content could be mroe demanding than usual.  I'm not totally sure because I don't use cc unless it's to test something, so my own observations about fps are mostly limited to the vanilla game.

For the speed question, are you trying to use ultra speed or perhaps something even faster?  If so, I wouldn't know what mods are available and work properly.  The game itself should speed up time when your sims are sleeping, although time often slows again when the game has to do a lot of calculations.  It can help to just leave the camera in one place while your sims are sleeping, especially if you point the camera outside the house at a patch of mostly unoccupied terrain.

Really though, this can take a bit of experimenting to figure out, or just paying close attention while you play.  For Sims 3, I could list out a bunch of lots, certain events, etc. that cause fps drops because I remember how things go, but I don't have nearly as intricate an understanding of how Sims 4 works, other than general ideas and a few observations.  So you'll need to play around with it yourself to some extent.

I do want to say again though that most if not all of this is about Sims 4 and its game engine, not your computer.  A cooling pad or fan can help for sure, but your hardware should still be able to handle ultra settings without any trouble.  It's the game itself that doesn't always cooperate.  And because it's not really a question of what your hardware can do in theory, lowering settings isn't going to help the way you might expect.  If the game engine can only handle a certain process at a certain speed, that's the limiting factor, not your laptop.