I dont know why they schedule the tt rides as they do. There should be an option to just ride the course and move on. I have tried 4 times to connect for the ride, zwift has an update or takes FOREVER to load, I miss my starting time, then have to wait 2 hours. For a non-race event it is utter uselessness. Just let us ride. And why does it take forever to load. The graphics arent that great? I play 3D games that require significantly more resources that load fastert then this.
If you are having delays in loading and running speed I would look at your equipment.
Also try giving yourself ample time prior to the event for any updates which actually aren’t that often.
I think it may be your computer, i have been using the Rides for a few days now with no issues and loads quite quickly