Hey Sean,
Thank you for reaching out to us!
The Events Calendar can handle large numbers of events and work well even in very high traffic websites. However, it is important to understand that performance is dependent on many environmental factors that the plugin itself is often unable to manage automatically.
You will find further information about caching and performance optimization in the following article:
https://theeventscalendar.com/knowledgebase/performance-considerations/
I hope this helps. Let me know if you need anything else in the mean time and I’ll be happy to assist!
Regards,
Patricia