This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
The mobileOK Checker follows and retrieves all links before it can run the tests. Retrieving links explains why a check often takes dozens of seconds to complete. For performance reason, having a "don't check links" profile would be good, even though that means that the result cannot be said to be mobileOK.