Buffering wegen DS-lite?

Excuse the lack of German but i thought I will ask here since DS-lite is very widespread in Deutschland.

Ever since I moved here a few years ago i’ve been having very bad buffering with my Plex server that is in Romania (the server has proper dual stack IPv4 & IPv6). Last year I have decided to put the Vodafone router in bridge mode which forced it to get rid of DS-lite and then I only had IPv4. This miraculously fixed all my buffering issues and I was able to play even 90mbps content with 0 buffering.

Now I moved to another city and o2 is not even giving proper IPv4 addresses anymore, so I’m back to DS-lite, with non-stop buffering again even though this connection is 1000mbps.

Is there something I am missing? Any easy fix that will get rid of the buffering?

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