Any new Profile will be set to an auto-pause speed of 1.0 by default. If you do a lot of fast riding and you don't want any slow ride sections to affect your average speed then you can set this speed to a higher value. You also have the option to turn it off.
Open the Profile you want to customize the Auto-Pause settings for.
Turn "ON" Auto-Pause.
Tap on the Default value"1.0".
Enter your preferred speed and tap on the "✓" icon.
This will now be saved as your Auto-Pause speed for this Profile.
You can quickly toggle Auto-Pause ON or OFF from the Control Center.