Hello again Lindy,
I checked the site and indeed, for the details to show up the first time sometimes took 10-15 seconds or more. A bit curious. Thing. Personally I’m sitting in Europe but it still should be faster.
I checked your site on GTmetrix.com and the results are pretty much ok.
There are 2 things I can recommend for you to check:
1. Switch to a default theme like twentysixteen and after clearing your browser cache (Ctrl + Shift + Del) check if they still load that slow. If they are faster, then there is something with the theme. If it is still similarly slow, then we can start digging deeper.
If it is still slow, then please run a test for conflicts based on this guide. This can help us eliminate any misbehaving plugins.
2. You could potentially use a caching plugin like W3 Total Cache, WP Super Cache or WP Rocket. Or something like that.
I also reco to read this article which might give you some insights and ideas:
The Calendar is Loading Slowly
Let me know the results, I’ll be waiting for them.
Cheers,
Andras