Note: This only applies to users running Mac OS 10.9 or later. Other users will not have this problem.
Bredbandskollen detects if you click outside of the webpage during measurement and immediately stops the test when this happens. Please leave your computer untouched during the time the measurement is in progress. This was introduced on January 1, 2014.
In order for the result to be as good as possible it is important that you do not have any other applications running during the measurement. Applications downloading files or otherwise consume computer resources that affect the measurement and produce unreliable results.
Some more recent Web browsers and operating systems distribute system resources differently if the application is active or not. Therefore, we have chosen to introduce this feature that only completes measurements if Bredbandskollen is the active application. This means that you cannot do anything else on the computer while Bredbandskollen it is measuring.
Our tests show that newer operating systems such as Mac OS X 10.9 contain relatively aggressive power saving funtions that restrict the non-active program's ability to do things in the background in order to save battery time. These features seem to be especially interested in limiting how many resources Flash uses because Flash is commonly used in banner ads. Below is a quote from http://www.apple.com/se/osx/advanced-technologies/ about the function App Nap:
App Nap helps you save power when you’re working with multiple apps at the same time. OS X can tell when an app is completely hidden behind other windows, and if that app isn’t currently doing something for you, such as playing music, downloading a file, or checking email. If the app is hidden or not doing something, OS X slows the app down. As soon as you start using the app again, it instantly shifts back to full speed. App Nap does the same thing with tabs in Safari so that only the visible tab is up and running at full speed. With App Nap the processor consumes up to 23 percent less power.
Bredbandskollen is a measurement tool and we put pride in being able to present the the best posibble measurement results. Maybe it feels a bit hard to wait while the test is running when you have previously been able to do other things at the same time. But the test is only going for about half a minute so take the opportunity to stretch your legs, get a glass of water or take a (fast) walk around the block.