Hello,
did anyone experience this wierd lag after ctrl+c inside non-QupZilla window and then returning to QupZilla windows? In this moment QupZilla stops responding for a while. It seems to me that this lag is longer and longer during time and restarting QupZilla repair this problem temporarly.

This is a known qtwebengine bug, should be fixed in Qt 5.7.1, when that ever gets released.......