If that is indeed the case, then it is still a regression, because previously it only took about a minute to execute the query and list the jobs from another server in our business unit.
However, it does not seem to work for me even after waiting for half-an-hour and refreshing the page. We're also talking about different jenkins core and plug-in versions here, as job-import 1.6 does not work on any of our servers. We had to roll back to whatever previous version was available for each server and still it does nothing.
For a fresh install on my localhost. I got below error on clicking "Query" button while importing -