Drastic Slow-Down in Loading Speed

Hello all, thanks for your time in advance.

I’m experiencing a 12-15 second lag in page loading time. This lag only occurs in page loading time and post loading time. This slowdown began late last week and I’ve reverted any changes made since then but they still persist.

Searching the catalog or registering for an event is lightning fast.

I’ve cycled through plug-ins and found none that seem like culprits (we only run 16-19) and have tried website caching through W3 plug-in but nothing has helped. If anyone could provide any feedback it would be much appreciated.

https://www.mylpl.info is the site in question.