There is something with the .574 client that is slower when it is pointed to an older server. Using a .574 client, it takes 2-3 minutes to see the Microstation splash screen and ProjectWise goes into “not responding” and with a .567 client it takes less than 30 seconds. The server version in this example is a .566 datasource.
The “fix” would be a server upgrade or client downgrade since Bentley doesn’t release patches