As for GTK3, rendering performance, latency and memory usage in QT5 suffer significantly. QT4 is not light, but QT5 adds overhead for no reason.<p>I like the general polishing in the core modules, but I have really no use for qtquick. For this reason, I <i>really</i> encourage anyone to get onto copperspice (<a href="http:&#x2F;&#x2F;www.copperspice.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.copperspice.com&#x2F;</a>). Without MOC, QT really feels an awesome API.