I gave up sim racing online after a crash and seeing the other players replay of the crash. I didn't think I was at fault but because of the lag, I totally was.
My ping from Australia to Europe was just too much in order to ensure others could have a safe race. When everyone else has 20-40 ping and I'm racing with 150+ it's just too much lag to be safe on the track
Wow a dedicated line is serious commitment. But yeah ultimately when you're connecting to servers on the other side of the world there's not a lot you can do.