To be able to load faster, the games stores data in so called cache files. The game checks on startup if those files are available and if so, they are loaded. If they are not available, they are created.
Over time these files accumulate out-of-date data (especially if you use custom content and mods) and because of this, it’s best to delete them from time to time (just as you delete your browsers cache from time to time).
When should I delete the cache files ?
While there is no harm in deleting them every time before you start the game that kind of beats the purpose of cache files.
It’s good practice to delete them in the following situations (list not conclusive):
- After removing mods
- As troubleshooting step if you have issues.
- When testing if bugs occur generally or just in certain situations.
Where can I find the cache files ?
The user files can be found in your user folder Documents\Electronic Arts\The Sims 4
Which files can I delete ?
The following files are cache files that can be deleted safely and that will help with troubleshooting.
There are other files that can be deleted safely but I don’t think they help with problems. Because of this they are not listed here. You can find more information here: User files explained.