Rule One
Don't rely on speed tests when it comes to IPTV buffering.
Rule Two is network speed internally.
For this part, you need to log in to your router and split the Wi-Fi so you can have 5G or 6G on its own name.
You can search the web or even ask your internet provider for how to split Wi-Fi.
Another part of your network speed: If you are using a cable instead of Wi-Fi, then your cable has to be Cat 6 and never 4 or 5 or even 7, Just 6.
Rule 3 and this is based on whether you are ok with rule two above.
VPN
Now this is going to cost, so don't jump in and buy anything until you test it and know it is working.
Currently, IPTV VPN is only for limited companies.
Nord VPN and Surfshark seem to be on top.
Buy a VPN and make sure they have a 30-day money-back guarantee.
Then make sure you are using VPN protocols, Open VPN TCP.
Ok, this is what I remember. And now that I think about it, I made too many YouTube videos about this, lol.