@Kitukunn Have you tested without mods, as in, moved the entire Mods folder to the desktop and deleted localthumbcache.package? If not, please try that now.
Please also test on a new save, still with no mods or cc, and let me know if you run into the same issue. I'm not suggesting you need to delete your current saves, only that it's a useful comparison.
Yes I tried without mods, tried a new save, and deleted localthumbcache.package makes no difference.
@Kitukunn Try testing in a clean user folder: Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, a clean folder will spawn with no content. (Your saves and other content will be intact in the folder you moved but temporarily not read by the game.) Don't add anything to the new folder yet; just start a new save and let me know how much RAM it uses.
If memory use is still high, quit the game, restart your computer, and this time, put the EA App in offline mode before launching Sims 4. Let me know whether this makes any difference at all.
I believe this is the case from your original post, but please also confirm that Sims 4 itself, as in, TS4_x64.exe, is using 5-6 GB RAM, rather than your system overall using that much.
moving the folder to my desktop worked, its only using 3 now! But what's going to happen to my old saves? When I try to play them it starts to use 6 again, does that mean they are corrupted or something? (and yes it was only TS4_x64.exe)
@Kitukunn If you move an old save to the new Sims 4 folder, and nothing else, does that save still use ~6 GB RAM?
If the save is still using a lot of memory, and you're willing to add another mod, try adding ShowSimInfo (the one by Frankk, not the outdated Mod the Sims version). Click on a sim and choose Search All Sims, or something like that; I'm not in-game right now. Let me know how many sims are in this save.
You can also try the backup versions of this save in case one of them runs better. Here's how to recover one:
https://sims4.crinrict.com/eng/2014/09/recover-backup-save-game/
