In my standard Ubuntu desktop I defined four workspaces. When I switch between them (e.g. use a key shortcut), I see the new workspace move in while the old workspace moves out of the screen. So far so good, nothing wrong here.
But from time to time, when the system is loaded, this 'switching' takes many seconds. So how can I speed up this visual effect, or disable this visual effect completely (I still want workspaces!)?
I might have installed several tweaking tools, but I cannot find the tool which I used to enable this effect in the first place. How can I find out? How to speed up/turn off this effect?