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Qt's QJson can't handle large integers [1]. As a result traffic statistics is inaccurate when tens of gigabytes are transferred. On the other hand, jsoncpp can handle 64-bit integers, which are sufficient as syncthing uses 64-bit integers, too [2].
To see the effects of inaccurate statistics, trasnfer 10GB of data within syncthing and then transfer some tiny files (e.g., a few KB). You will see the tray icon rotates for a long time.
Not sure if it's a good idea or not to add one more dependency. jsoncpp is a dependency of cmake, so it should already be there if one can build QSyncthingTray. I can also try to make jsoncpp optional and fallback to QJson if you wish.
[1] https://bugreports.qt.io/browse/QTBUG-28560
[2] https://github.com/syncthing/syncthing/blob/v1.1.4/lib/protocol/protocol.go#L905-L909