Hi Fuchs913
We have started an investigation on this matter. Our IT department is looking for a solution that would not show any loading state in all web browsers.
It may look like page load times have increased, but that is actually not the case. Firefox interprets our listener object as a object that is actively in a loading state, but nothing is being loaded during that time. Did Pingdom really show higher load times when the latest version of our plugin was active?
Please also note that the listener object is only active if you are logged into WordPress. A visitor to your website who is not logged in via the administration panel, will not have the listener object present, which means that no loading indicator will be shown to them. Google will also not be logged in to your website, so there is no possible impact of this loading indicator to your search rankings.
We will let you know once the problem is resolved on our side. It is only a visual defect though, which has no impact on your website performance.
All the best
Rublon Team