I use the Forza ios app, and during the last few games I had to literally hide my phone to avoid its notifications. The lag was more than a minute on England matches.

To be fair, apart from the lag and that crash at the end of one game, the BBC stream was a rock-solid HD, and it almost never buffered. ITV instead was low-res crap, stuttered all the time, and even had compulsory ads. Both streams got worse as the tournament neared the end, of course; in the first rounds the latency was only a few dozen seconds.