@robinl: I've seen that problem. The updates very infrequently when there is a high FPS application running, for example glxgears or fgl_glxgears. I believe this is a bug in compiz. Setting "Wait for vertical refresh" under "3D-More Settings" to "Always on" works around the problem for me because it forces the applications to a lower frame rate which doesn't overwhelm compiz.
Do you have any applications running that constantly redraw at a very high frame rate?
@robinl: I've seen that problem. The updates very infrequently when there is a high FPS application running, for example glxgears or fgl_glxgears. I believe this is a bug in compiz. Setting "Wait for vertical refresh" under "3D-More Settings" to "Always on" works around the problem for me because it forces the applications to a lower frame rate which doesn't overwhelm compiz.
Do you have any applications running that constantly redraw at a very high frame rate?