Hi,
Thanks for the interest in our plugins. I used to work for a radio station and mange 15 of their websites. I could never get them to use the calendar though!
Anyway I think you may run into a similar situation with our plugin. That is a large amount of events for shared hosting.
Usually the page that causes the most issues is the month view.
So, we are adding better month view caching in our 3.10 release, but I do not have a timeline for its release.
That may help it work better for you, but I could not say for sure.
Let me know if you have any follow up questions.
Thanks