@JanelleHD Chrome can be a huge resource hog, and in fact there are memes about it all over the internet. But given that your computer has 16 GB RAM installed, 55% puts the total use at almost 9 GB, which is far too much. So please do post a screenshot of the Task Manager's Startup tab for me to look over. You could easily have a bunch of other apps running in the background that you don't know about, but malware is also a (less likely) possibility.
Either way, this should be addressed. While Sims 4 can run in the 7 GB or so your system has left over, multitasking could eat into this total. And the extra overhead could affect how much processor power is available as well. Plus I personally would just want to address this even if I had more than enough RAM and CPU to cover the extra use.