I completely agree with you, Mrs. Flynn! As someone who runs 8 GB's of CC....I definitely recommend stay in the 2 -3 GB range. While there is no limit to the amount of CC the game can handle, the more CC you add the more chances of something going wrong are going to happen. As for subfolders, usually if enough packages end up in them then I take that as a sign to merge them. After that, I put all my merged files into a subfolder called "compressed CC." The file itself is labeled with what's contents are in it EX) Hairs - Chazy. Backing up the merged files before compressing them is a good idea too for when you have to eventually sort through them again.
I play with a lot of CC in my game (I thought it was 5 GBs at most until I checked it recently...

) so my game (likely) requires more maintenance than the average players'. For example, I am constantly moving my sims due to lag, however, I did have to do that even before I started adding CC to my games.
Here's some things I do once I notice loading times are getting longer:
- Clear caches (I try to do this before every play session but I get lazy some times)
- Clear sim inventories
- Use Save Cleaner by Kuree (This has SIGNIFICANTLY helped to prolong the my save files but I know that some people have had mixed results with it)
- Move towns (As mentioned above)
- Disable certain weather (rain, hail, etc)
- Slowly lower the amount of high detailed lots
- Set the game to a singular lunar phase (full moons can cause problems in my game)
Things I have automatically done to improve loading times:
- Disable memories
- Disable interactive screens
- Added NRAAS mods (even if you play in a full vanilla game, they are a LIFESAVER. They fix so many issues that the game itself causes)
Some content is harder on the games than others. As a general rule of thumb, I have noticed that store content/sims 3 packs effects the game worse than sims 3 packages. I'm not sure why though.
Another note is that the more intensive the game is (as Mrs.Flynn said, the amount of expansion packs and stuff packs in your game definitely effect your ability to play with large amounts of CC) the less CC you will be able to run. This goes along with towns.
In my experience, these are the towns that heavily modded games do well in and heavily modded games DO NOT do well in:
Download CC to Your Heart's Content (Within Reason):
- Dragon Valley
- Sunset Valley
- Sunlit Tides
It's Response to CC Varies:
- Midnight Hollow
- Twinbrook
- Monte Vista
These Towns Hate You:
- Isla Paradiso
- Bridgeport
*Again, this is just based on my own personal findings. Results definitely vary from computer to computer. A lot of towns aren't included because I haven't done enough research in them*
My games on average take 5 - 6 minutes to load. Usually during that time I will just do other things because I like playing a heavily modded game. Another thing to note though is to do what I say and not what I do; I am the definition of "this player added too much CC to their game and is holding it together with duct tape." Also, I bought my gaming PC specifically to run the sims...so I could install more custom content.
I hope this helps!