I'm getting some fairly horrid upload speeds on PlayStation, which is required to get SharePlay to work.
To cover off the basics, yes I know that the estimates on the PSN dash are guesswork, but it's so low as to be ludicrous.
We have 100/20 UFB. This works pretty well across the board, speedtest results show generally 3ms latency and hammer the speed at line rate. The internal network is fully wired on gig, with the PS4 directly connected to the Fritz box. The rest of the network "works fine" and the internal network is sufficient for PS4 streaming and steam streaming (which suggests the devices' local net connections are fine, the hardware isn't the issue, but I've also swapped cables and ports to be sure).
When testing the PS4's network speed, it usually comes back with 70-85 down, and a paltry 2.5 up. This is insufficient for SharePlay, by a significant margin (apparently, 5 is the minimum). A PS TV on the same network reports 1.2up relatively consistently.
I visited a friend's house with a PS4, and he gets 12-14 up on his Spark connection, which makes me suspicious of the 2degrees link to wherever Sony use to measure this stuff.
Differences in our houses are a) he's got a PS4 Pro (mine's vanilla), b) he's with Spark, and therefor c) he has a different router.
Are there things I can do on the Fritz box to increase PS4 performance? Is this a "known issue" with 2degrees' network? I've tried calling support but got the usual "we don't control the internet and BTW it's probably the stuff in your house, LOL sorry not sorry," which wasn't actually helpful.