Hi,
Thanks for using the Events Calendar.
Here on the pre-sales forum, I’m afraid we do not provide technical support. I would ask that you take any technical support questions across to our wordpress.org forum – our staff scan it periodically and other community members may also be able to help out.
To quickly answer your question we do not have caching in the current version, but will have some caching for month view in 3.10. What you are experience could be coming from your hosting or a caching plugin, but not typical of our plugins and Pro would not change that.
Thanks again!