Re: Recommended requirements for Sims 4 and all packs?

@waterywatermelon  Your processor is more than sufficient for ultra settings in all three games, as is 8 GB RAM, although it would be best to keep the multitasking to a minimum while playing Sims 4.  You could also add more memory if you wanted: it's about the easiest upgrade there is.  I don't know what kind of hard drive(s) are in your computer, but given its age, you might have no solid state drive at all, or else one that's too small to hold your games.  In that case, adding one and installing Sims 3 on it would make for a significant improvement; Sims 4 would be less affected, and Sims 2 probably not at all.

You could also upgrade the graphics card, but your options would depend on the power supply and whether it has (or you're comfortable adding) one or two power cables that would run from the PSU to the card.  If you're not sure, just list the specs of the PSU: manufacturer, wattage, and rating.  The space inside the case also matters, specifically the length between the back of the case and the first obstruction, measured along the length of the graphics card or its slot.

If you're thinking of getting a new system, of course none of the above matters.

Sims 2 is the least demanding of these games by far, so it's no surprise you're able to play without much trouble.  Sims 3 is actually less forgiving on lower-end systems than Sims 4, although the requirements for ultra settings are essentially the same at this point.  As for why slowdowns happen in Sims 4, yes, there are plenty of other reasons, probably including some sim generation as in Sims 2, but I haven't really looked into it.  In Sims 3, the game seems to create new NPC sims as a save is loading, so you wouldn't necessarily see any lag, just a loading time that's a minute or two longer than expected.  Lag usually comes from the game engine trying to reroute stuck sims, or from similarly endless loops, but in many scenarios, if the issue didn't resolve, you'd llikely see a crash before long rather than extended lag.

As for why Sims 4 doesn't have a convenient way to uninstall individual packs, I believe it has more to do with Origin than anything else.  Most Origin games' DLC has a trivial impact compared to the base game, and therfore there wouldn't be much cause to uninstall that DLC.  So the feature was never built into Origin.  It's not currently in the EA Desktop App either, although that's still in beta.  Disc installs predate Origin, and the installers were often built for their specific game, so there was more room to add features that only that game might need.

@puzzlezaddictSo, I just checked for the type of hard drive, and it's a hard disk drive. The computer was purchased in 2016. It has only been about 5 years.

I usually don't do multi-tasking or have multiple windows while playing The Sims 4. It's usually The Sims 4 that is open. But, if I open the Task Manager, I can find a long list of background processes and apps.

Lag usually comes from the game engine trying to reroute stuck sims, or from similarly endless loops,

I think part of the reason why the Sims 2 runs more smoothly is that the game does not reroute stuck Sims. If Sims can't get to the destination, they will just stop what they are doing, and they may do something else instead. Also, it's a closed world, not open world, so all pathways are located on the lot. As long as the lot is all routable, it's fine.

@waterywatermelon  I didn't mean that your computer was extremely old, just that at the time it was assembled (the processor is six years old, which gives me a ballpark), it wasn't common to include a large SSD, especially for a lower-end or mid-range system.  SSDs were quite expensive even a few years ago.  Now though, you could get one of these:

https://www.amazon.com/dp/B07G3KGYZQ

https://www.amazon.com/dp/B07YD579WM

or the higher-end option:

https://www.amazon.com/dp/B089C73T72

stick it in a drive bay, plug in two cables, and have much faster loading times.  I don't know whether your motherboard has an M.2 slot—some of its generation do, some don't—but if it does, you could instead install an NVMe SSD in that slot, without plugging in anything else, and get even faster read and write speeds.

https://www.amazon.com/dp/B086BGWNY8

https://www.newegg.com/western-digital-blue-sn550-nvme-500gb/p/N82E16820250134

https://www.bhphotovideo.com/c/product/1437035-REG/intel_ssdpeknw010t8x1_660p_1tb_ssd_pci.html

https://www.amazon.com/dp/B07YFFX5MD

I'm not saying you need to, exactly, but having an SSD is a significant quality of life upgrade, particularly if you take the time to reinstall Windows on the SSD, which is simple to do.

And again, you could upgrade the GPU if you wanted, and perhaps relatively cheaply if you're willing to buy a used product on Ebay or have a friend who's upgrading to a brand-new card and would sell you their old one.

None of this addresses the fact that Sims 4 will run slowly sometimes.  It just means that the slowdowns are not as dramatic or as frequent, and of course that you could use higher settings.