Learn to change your vpn server country. Best available isn’t always best available. That’s a good VPN, but be sure you have adequate speed on your internet package as vpn will decrease it

change your DNS....drastically reduced my buffering....Comcast servers were constantly throttling my speeds.

There are many things that can cause buffering aside from your VPN settings. Sometimes it’s your provider being over capacity especially during peak hours and when popular content (like a big game or fight) is airing. Sometimes resetting/rebooting your devices and re-installing your IPTV software can clean up buffering issues.

Or internet connection, or better wifi signal if you’re using it.. it can be many things

Does your internet speed change after you start using the VPN?

VPN, servers not reliable

Clear the cache…

reset router to eliminate throttling..

HDMI 48 gbps seems to work extremely good.

Use 5ghz band on a dual band modem and make sure it's the only thing connected especially if using WiFi.