excel - VBA Userform a lot slower than without Userform -

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i have created user-form in vba complete tasks done entering values in cells , clicking buttons run vba code.

one of these tasks go through table , add date in table x months entered user. example date 1/1/15, user enters 5, new date 1/6/15.

apologies cannot copy code work , not allowed too.

however when task done entering x in cell , clicking button taking ~1.5 seconds complete. user-form doing exact same task exact (or more efficient) back-end code taking ~7 seconds.

is able hazard guess why user-form taking longer?


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