I got the same issue sadly... Link to test Youtube video if you see on the video i can't even switch to other players...
I have the same problem on Ps5. Connection Score 98-99%. Delay and muddy, heavy gameplay. Especially during prime time. Middle europe.
It feels one-sided so I suspect something with the lag compensation. A few years back you decreased the buffer time of the lag compensation. After that It was much better. Then you switched it back since many ppl got speed up lag.
Maybe the solution is to pair players also depending on their connection quality. Potato internet against potato internet...
