FWIW I work in a place which uses a lot of C++ and cares a lot about performance. I have seen a lot of really bad Qt UIs as far as responsiviness. The Signal/

FWIW I work in a place which uses a lot of C++ and cares a lot about performance. I have seen a lot of really bad Qt UIs as far as responsiviness. The Signal/SLot framework can get really hard to follow in huge code bases with lots of state. The whole thread interaction in Qt is not ideal. It is interesting because most of people are now actually using PyQT or pyside. Even with these being slower than pure Qt. Because it is easier to adjust to business requirements with Python. Oh, and I have personally rewritten some of these UIs in React and replaced them with a web browser which made them much more responsive.