Slider keeps getting redrawn

[gordcragg]

I encountered a very similar issue last year, and nothing I have attempted so far has fixed it.

Apparently it is a shortcoming of CoreGraphics, as Jules explains in this thread:

Again: unnecessary Calls to paint() MacOSX

Here is a simple Demo-Component. It owns two opaque components. If you repaint() both of them at the same time, the parent-component paint() method will be called too (but it will not redraw, confirmed with random colour-fill).  So if there is nothing repainted, why is it called? Maybe room for huge performance improvment?   class MainContentComponent : public Component, public Timer { public: MainContentComponent() { addAndMakeVisible(c1); addAndMakeVis…

I assume this is the problem you are encountering. I tried using the JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS macro but it didn’t reduce the number of unnecessary repaints - perhaps I am doing something wrong or misunderstanding.

This is a huge issue for me, as I have many sliders placed between meters in my plugin UI. They repaint so frequently that it spikes my CPU usage in macOSX. I have even considered a major UI redesign simply due to this issue, but it would be an unfortunate compromise. Everything works as it should on Windows.