Multiple device question

I’ve been running pihole on my rpi for a while now and installed pivpn last night to be able to run everything through pihole while out of the house.

It works great on my phone, but when I connect to the vpn on my phone and ipad at the same time only one device has decent internet speeds at the same time. The other just screeches to a halt. I’m new to pivpn so I assumed it would work like any other vpn app.

Using the WG app on the phone and iPad with the provided QR code from pivpn.