Hi Chris,
Thanks so much for reaching out!
As a first step, I would recommend ensuring that your Events Calendar related plugins are all up-to-date.
Also, please have a look at our Performance Considerations and see if there is anything you can adjust in order to help your site run better:
https://theeventscalendar.com/knowledgebase/performance-considerations/
After that, you may be interested in caching, so take a look at this article: https://theeventscalendar.com/knowledgebase/caching-basics/
In addition, you can check out some of the solutions provided in this forum post:
https://theeventscalendar.com/support/forums/topic/decreasing-loading-time-for-big-amount-of-events/
I would also recommend looking into some of the plugins in this blog post, as they may be able to help you pinpoint where site slowness may be occurring:
https://theeventscalendar.com/favorite-developer-plugins/
Let me know how it goes and if you need any further assistance on this topic!
Thanks,
Jaime