It's rather simple actually, but first things first : Thread's title is slightly misleading, as it's not on the fly switching anymore.
I am not sure this could be duplicated in single display mode.
OK, fortunately I didn't use Alt+tab to restore a minimized screen, nor did I have to bring the GUI upfront (that's what I really mean by on the fly).
If one pauses emulation, it becomes possible to switch from full screen (I use full screen + autoVsync) to full window as I described, with a temporary black screen as a minor side effect.
From full window (with the game unpaused and Disable sound When Inactive ticked), press middle mouse button, then drag the mouse cursor outside the screen (sound should be disabled at this point) -> the speed changes dramatically. Speed gets back to normal when the screen regains focus.
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