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.

** Also affects: qtdeclarative-opensource-src (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1383343

Title:
  Application icons take a long time to load on slow network

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