OpenVPN Client on Router Causes Some Sites to Load Very Slowly

I am running the latest Merlin firmware on a 68U. I am using the OpenVPN client on the router using PIA VPN as the provider. I am using policy based routing to route a small subset of clients through the VPN. Most of the clients are mobile devices with a couple of light use laptops.

My problem is whenever I have the OpenVPN client started the clients using the VPN load certain sites very slowly. It almost seems like they are waiting for some request or requests to timeout before loading...

OpenVPN Client on Router Causes Some Sites to Load Very Slowly