Waaay back in the days of Sims 3, loading the game took a while. *pulls out elder cane* I'd leave my computer loading to do something else or pull out a book to read. Sims 4 doesn't take nearly that l...
My loading screens can last a while (I have an obsolete MacBook Pro), so I use the waiting time to set up a cozy space for when I play... Light a candles, get a beverage, that kind of stuff.