A few useful things: You can set the QT_FLUSH_PAINT environment variable to see which parts of your widgets are getting repainted.
You can set the QT_DEBUG_PLUGINS environment variable to see what's happening when Qt loads plugins (E.g. image formats) You can view all the requests passing through QNetworkAccessManager as detailed here http://blogs.kde.org/2010/05/01/qnetworkaccessmanager-proxy-classes You can get the details of what Qt sees when connecting to an SSL server as detailed here http://blogs.kde.org/2011/01/09/getting-details-ssl-connection You can make your SSL traffic decryptable by wireshark as detailed here http://peter.hartmann.tk/blog/2013/04/decrypt-ssl-traffic-of-qt-programs-in-wireshark.html Also many of Qt's subsystems have defines that can be enabled at build time to dump information about what they're doing as debug messages. Cheers Rich.
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