I wished Qt just split into a different widget set for mobile. The interaction behavior is significantly different that attempting to reuse the same UI for both mobile and desktop will result in a terrible experience on both.<p>Likewise, QML is just plainly useless on the desktop, and <i>much</i> slower to booth. Unfortunately, the performance regression in Qt5 is there also if you don&#x27;t use it, and that shouldn&#x27;t be.<p>Qt5 being slower than Qt4 is the main reason I&#x27;ve been moving slowly towards copperspice (<a href="http:&#x2F;&#x2F;www.copperspice.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.copperspice.com&#x2F;</a>) for newer projects. The fact that moc is no longer necessary removes also the main paint point of qt.