Unity Editor taking 30+ seconds after pressing play when internet connected?

I have just added a rule to my firewall blocking all public outbound traffic related to Unity.exe which has helped dramatically decrease the wait time from play button pushed to the game starting.

Usually my game is running within roughly 4 seconds. But some days much longer (like today), as I suspect some server somewhere is down. So now I had a chance to watch the behavior change as I added the firewall rule.

How do I debug what Unity is waiting for (and timing out on) each development cycle? I have tried logging out and working offline, but it still hesitates.

Or can I figure out if any of my 3rd party libraries are causing this delay?????

[UPDATE]
Nevermind, it was an FTP server that was not responding. Pretty sure I have solved this issue...