On desktop I'm a moderate fan of Qt...<p>Some time ago I worked on a device that used a Qt5 QML touch interface (it was developed by a contractor, I was working on the backend). The UI wasn't anything too special, simple 2D things: menu over menu, some basic graphical representations (live 2D graph, and some dials were the most demanding parts)<p>The hw was a single core am335x (hardware-wise the stack was very similar to a BeagleBone) and the UI performance sucked. Whatever we did, it was just simply choppy and jagged all over the place.<p>I really liked a lot about that device, but that UI performance... that just killed everything. And I just didn't believe that the hw is that underpowered, for that paticular UI. So some time later I have implemented about half of the UI with raw OpenGL2, just out of curiosity, and indeed, it was much more responsive and fluent, with much lower CPU usage. But that was just a PoC, for my own amusement. That made me quite disappointed in the embedded performance of Qt.<p>Is QT for MCU usable for actual MCUs?