Why is the refresh rate slower in lab mode? photoshop cc 2014

hi
why is the refresh rate slower in lab mode?
for example i load an image , rgb , ad an adjustament layer -> curve and i start to play with curve -> the refresh is instantaneous (i mean the image become more dark or lighter instantaneous )
but if i load an image -> conver in lab mode , the refresh rate is slower
i tried cs6 too, same behavior
ps how can i have an email to notify me that someone answer to this discussion?
thanks

hi
there is nobody can check it?
under windows 7 or 8
thanks

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Why is the refresh rate slower in lab mode? photoshop cc 2014

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