Clutch pedal return?

Hi,

Just wanting to canvas opinion - have a strange clutch issue in my '11 MCS - when accelerating through the gears at high rev's (not red-lining but with quick acceleration) I've noticed the clutch pedal has a delay in returning - I come of the pedal after putting in gear and there is a delay in return noticed by the pedal hitting sole of my foot,

I'm reasonably confident it's not my operation (e.g. throttle before the clutch has bitten) - I've had the chance to drive higher powered cars (turbo & non-turbo) and not come across this - I'm not slamming through the box with quick gear changes but driving normally, changing at higher revs I notice a delay almost as if it's slipping and the pedal has a 1/4 second of a delay in it's return movement,

It may just be the performance characteristics - just wanted to know if it's something that others have experienced?

Thanks