"Local" URLs can also be slow.
This might jeopardize loading large local directories where a resorting could take place but imho it's better than leaving the user wondering when files will finally show up. However, it takes some time for KDirLister to initially signal items having been added, and only then our 2 second timer starts.
Also, stop the timer when loading has completed.

• Entered a very slow mount, got files to show up periodically. The first time it takes like five seconds but after that you get files in a steady 2 second pace