Hey Phillip,
Welcome back 🙂
Speed can be caused by numerous factors, which is unfortunately out of the scope we are able to provide on our support forums. I really wish I could be of more assistance – but with so many diverse website environments, it would be impossible for us to cover all those bases.
We have added an option found under Events > Settings > Display that may improve the speed when viewing events in Calendar view (see screenshot below).

I recommend running your site through GTmetrix and see if there is anything that stands out in regards to slow page load times. That information may help narrow your problem down.
I apologize again I’m not able to be of more assistance, but I wish you the best of luck improving the performance! Have a great week 🙂