Performance issue with OpenGL in multiple windows

[clarke]

This could be relevant:

OpenGL Swap Interval - MacOS

Yeah, that’s what I see on macOS too. Using the CVDisplayLink as suggested by @yairadix above does fix this problem and the rate is then correctly limited to the display’s vertical refresh. Hopefully the JUCE team will implement that change. A temporary ‘hack’ to limit the frame rate approximately without changing any JUCE code is to use the OpenGLContext::executeOnGLThread() method to call Thread::sleep() for an appropriate amount of time (based on how long since the last renderOpenGL() callb…