Caching will certainly make it less impactful, especially if you're using a fixed size. I'd recommend checking out this whitepaper, which is excellent: Designing Efficient Workbooks | Tableau Software. It goes over quite a lot of techniques to ensure efficiency in your workbooks. There are also tools for testing performance and gleaning insight into what is happening under the hood on your Tableau Server instance: namely, TabMon and TabJolt. You could use those on an isolated test Server instance to gauge the impact of loading your display viz over and over again at the rate it's being current hit at, and determine what the cost in resources is.
Thank you for taking the time to help a newbie.
I've only been in my current position for a couple weeks. I'm having some issue configuring TabJolt and I'm waiting for IT Support to install TabMon (had to go through them.) I'm glad to hear that these tools will allow me to make the assessment I'm looking to do, once they're finally installed