February 2021
@IamYourTrendSim There is no maximum amount of allowed custom content with Sims 4. However, as you're seeing, the more you have, the longer the game will take to load. Some of this depends on the speed of your system as well: the process will go faster if the data loading is stored on a solid state drive, or to a lesser extent if the processor and RAM run at faster speeds.
If you're unable to play because the game takes too long to load, then the solution (at least in this case) is to cut back on the cc. I can't tell you how much cc is too much, since that will depend on your tolerance for long loading times. But maybe there are items you never use in-game that you could put aside. Or you might have themed items that you only use in one or two saves; you could swap these back and forth depending on which save you intend to play. Some people even have multiple Sims 4 user folders (the one in Documents\Electronic Arts), each with a different theme, e.g. one has Medieval content, another has magic fantasy stuff, another has normal content.
There's probably a good solution for you if you're willing to spend a little bit of time organizing things.
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I don't work for EA. I'm just trying to help fellow players with their games.