Qt signal is ten times slower than a virtual function

Passing extra arguments to Qt slots slot qt With Qt being used on microcontrollers these days, It made me wonder about the overhead of signals and slots on single coresingle threaded slot attack Define your own class with Qt signals and slots: To provide a class with its own signals and slots, the following applies Rules to be followed:

slot ra A slot is a function that is called in response to a particular signal Qt's widgets have many pre-defined slots, but it is common practice to subclass widgets