Qt signal is ten times slower than a virtual function

Why Does Qt Use Moc for Signals and Slots? signal slot qt As a workaround, you can manually connect the signal and slot in your C++ code like I mentioned in this comment in the signal slot qt Traditional syntax: SIGNAL () and SLOT() () and () macros allow Python to interface with Qt signal and slot delivery

signal slot Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time