Sounds like throttling if its fine with a vpn

Buffering is really the biggest moving part in iptv, and I'll try to be as respectful as possible as to not offend any providers. So buffering can be caused by server location in relation to you causing latency delays, stream supplier issues/delays, isp throttling, certain codec won't play well on certain apps, etc. That being said certain providers can also just afford better streams and better servers, vaders has refocused on providing a higher quality service and that could be a reasoning aswell. That being said clearstreams may also just not be good in your area which doenst discredit anything from there service.

What that guy said about location. When you're using your VPN, the connection for clearstreamz may be originating elsewhere compared to when you're not behind one. I've experienced this with vaders, without VPN vaders gets choppy because it sends me to their new york servers as my bast option based on my location, but when I use a VPN to connect from new york it connects me in miami and surprisingly the streams are better and don't buffer. It's weird I know, but I think it's due to some algorithm that they, or theirs server systems use that's just wrong. Vaders used to allow us to change the server we would connect to and it was great, because if you got buffering, you'd simply change your server, restart the stream and if all was good that was it, but that option was taken away when they started focusing on better service and now their servers decide where you get your streams and it sucks. I can't be behind a VPN to access them because I also like to watch Netflix and I know for sure that my isp doesn't throttle the connection because I can redirect traffic to their different servers through a script in my router to get rid of buffering, but that messes with their token system and some streams don't work. So we're at the mercy of their system, it's something you have to learn to put up with, because the alternative is getting service from your local provider at an astronomical price. I think their best option would be to allow users to change their server connections to find the best ones for them, this would better show the providers what host servers that they pay for aren't up for the task, for example, if one server has only a few connections per month to it, that should at least spark some investigation, sometimes the servers themselves balance loads in such a way that they're not suitable for IPTV streaming. The server has to offer up the stream at a minimum bandwidth based on the streams bit rate for it to not buffer when it gets to you, and I think that those load limits are either exceeded (most likely) or set up incorrectly. Maybe one day it'll all get sorted out, I'm still hoping vaders returns the option to select server manually.