So I have 2 providers using Tivimate on a Fire Stick 4K. Most channels buffer to the point where they are almost unwatchable. I recently upgraded my internet to 1 GB/s to see if my internet might be the issue. I ran a speed test on my device and I am pulling ~400 mbps on the Fire Stick without a VPN, ~200 mbps with a VPN. Does this sound like a provider issue, device issue, or am I unlucky and it’s an issue with both providers?
You could have a bad path to your IPTV provider. What's the ping like?
You might also try a couple different VPN's with nodes near the provider, not necessarily near you. It might improve the route for you and make the difference, or at least give you more info on the underlying problem.