Hi Heather,
I know the pain of ArcGIS all too well listening to my fiancee complain in the other room. Perks of working together through the pandemic. 😉
But, I can say that's not what I'd expect from Storyline! Typically when we see issues with the application slowing down or crashing our team is able to isolate it to something in the particular file or interaction on your machine with another app.
I'd love to have our Support team connect with you. They're around 24/7 using the link here for email support and 360 Teams Customers also can access chat support there 24/5. I opened up a case for you and they'll be reaching out soon.