Originally Posted by AdamW
I have to re-adjust my descriptions. I looked into it more carefully. It appears that everything is smooth in the desktop... except the Activities transition (in and out). Odly even the workspaces sidepanel animation within Activities is smooth! Scrolling in Firefox is also smooth on websites like this forums. Very weird but it has to be reported. Activities in/out animation is VITAL for desktop experience. It may well be the reason why I finally ditched Ubuntu - the main desktop elements there were slow to appear and fade away, with no perspective of improvement.
glxinfo | grep renderer
OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset