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I verified this with two applications using OpenGL using a GQLWidget. If screenupdates are very frequent, so say 30 fps, and/or resolution is high, CPU usage of one of the cores skyrockets. I’m looking for a solution on how to fix this and/or verify if it happens on Windows as well.
In my experience QGLWidget itself is a very efficient thin wrapper around GL and your windowing system; if you have high CPU usage using it, well chances are that you’d have high CPU usage using any other way of implementing an OpenGL app too.
If you have high CPU usage using OpenGL, chances are either:
e.g Debian will do this if you don’t install any graphics device
drivers.
The fact you mention display resolution as a factor rather suggests the former problem.