Comment 5 for bug 1383343

My guess for this is this:
 * There is one thread in Qt doing asynchronous loading for file, http and custom-provider images
 * The images on the dash are asynchronous
 * The Qt thread doing asynchronous loading pauses processing requests if there's 8 http requests going on
 * If the internet is slooooow it may happen that there is 8 http requests going on and thus the file local ones are stalled until one of the http ones finishes

Qt 5.6 will have a fix for this (and so will be if we backport the QQuickAsyncImageProvider patch as planned https://codereview.qt-project.org/#/c/108540/ )

I can also provide small patches against Qt 5.3 and Qt 5.4 if we want to carry those.