Time of black screen in stand by mode

Hi
I've purchased af MacBook Air 13" a couple of months ago. Sometimes when it has been inactive for some minutes it turns to standby-mode/black screen which is fine. But when i move with the cursor or click on the keyboard it doesn't turn back instantly. It can be up to 10-20 seconds before something happen. I am sure that it before just took a split-second, so why is it so slow now? At first i thought it was completely frozen.

Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".

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