After long last of living in the dark ages, I've finally managed to get FTTP installed (Fibre 900).
Got some weirdness though, if I download a steam game, i can download it pretty quickly at 500-600mbps - acceptable!
If i go to speedtest.net, thinkbroadband.com, speed.cloudflare.com etc (basically any speed test) - it caps out at 20, maybe 30mbps.
To add to this, i decided to download one of the many videos i watch, now the site i download this from isnt the fastest and i generally download it at 20mbps - If I attempt to download the same video from the same website, i get it at 200kbps!!
Now, I also happen to still have the old copper line still functioning (80mbps)... if i swap between the 2 lines, the speed difference is mega on speed tests and some websites, where the copper line is out performing the FTTP.
The part i dont quite understand, is that some websites (like steam) or YouTube streams set to 4k are blazing fast!
Anyone got any ideas as to what it going on?
EDIT: I'm using a Unifi UCG-Ultra (connected via PPPoE)
I'd suggest putting the Sh2 back and trying the same tests first, that'll rule out/in issues with your set up.
I'm most surprised your other line is still working for broadband.