Qt signal is ten times slower than a virtual function

When a signal is emitted, the slots connected to it are usually executed immediately, just like a normal function call When this happens, the signals and slots

Qt Signal & Slot implementation is deterministic, but it's using QVariant to box and then unbox values, so there is definitely a performance

qt slot How Qt Signals and Slots Work Understanding Signals and Slot in Qt Signals and slots C++

qt signal slot example Example code for singnals and slots writen in c++ using Qt framework - ExecomNordcpp-qt-signal-slot-example