There's quite a few troubleshooting tips for relieving game lag. Please forgive any that you've already tried.
1. Deactivate Origin in Game -- Open Origin, Select Origin > Application Settings > Origin In Game and deselect to disable Origin In Game.
2. Try playing the game in "Offline" mode -- In the Origin Client, go to the Origin Menu and select Go Offline.
3. Empty Sims personal and family inventories. Often too many items in the inventories can cause issues. - Also, having a large family and house with a lot of furniture/decor and landscaping will cause lag after awhile.
4. Reset Sim and/or Household - Have them travel
resetsim [firstname lastname]
Have them all travel to another lot, and then send them home. This should reset all family members. -- * Use the M key for map, for fast travel.
5. Repair Game:
In Origin > Games Library, right-click on Sims 4 and select Repair
6. Even if you don't play with mods or custom content installed, it's a good idea to clear game cache and the localthumbcache.package from the Sims 4 folder.
How to Delete Cache Files
https://sims4.crinrict.com/en/2014/09/delete-cache-files/
7. Move the Tray folder to the desktop, as a test. - This helps the game from loading what you have stored in your library.
Your Tray folder should be found using this path: C:\Users\<Username>\Documents\Electronic Arts\The Sims 4\Tray
8. Move your saves folder to the desktop, and only move back a few current saves, as a test.
C:\Users\<Username>\Documents\Electronic Arts\The Sims 4\saves
--- Having a lot of older game saves and a lot of files in your Tray folder will cause lag and freezing in-game.
Be careful in removing save games. As the saves may have many .ver files that go along with it. If you delete the main save file, the game can't recognize the save any longer.
Main save game example:
Slot_00000002.save
Save game backup examples:
Slot_00000002.save.ver1
Slot_00000002.save.ver2
9. Move your Screenshots folder to the desktop, as a test.
This may help reduce lag/freezing in the game. - Moving the screenshots folder will not mess up the game. And the folder will be regenerated. This will help lessen the load on the game due to the large size of the screenshots.
10. If you feel the game lag is game related, you may want to report it to the Sims 4 AHQ forum - https://answers.ea.com/t5/Technical-Issues-PC/bd-p/The-Sims-4 and offer to share your game saves and/or crash files with the Sims Team.
[INFORMATION] How to Send User Files to The Sims 4 Team
http://answers.ea.com/t5/The-Sims-4-Bug-Reports/INFORMATION-How-to-Send-User-Files-to-The-Sims-4-Team/td-p/6065302
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