IPTV on Android TV with a VPN?

I'm trying to use an M3U IPTV provider on my Android TV with OpenVPN. I confirmed that OpenVPN works (both with the OpenVPN app, and the provider's app), and that I can use an app to connect to the IPTV provider. If I connect directly, it's fine. If I connect through the VPN, the video plays but stutters and buffers. Given I use a VPN elsewhere on my network and can get 15+ mb/sec download speeds on torrents, I don't think the issue is the VPN connection. I think the issue is the TV running the VPN -- that my TV's CPU can't keep up with the encryption fast enough.

Is there some method for using IPTV on my android TV, and have the VPN connection terminated at my home server?

• Is there some IPTV server software I can run on my home server that I can setup the M3U playlist with, run over OpenVPN, and connect to from my Android TV?
• I see that there are M3U plugins for Plex. Is there a setup that would allow me to use OpenVPN only for the IPTV connection for Plex?
• Is there some other setup I should be considering?