Why is my phone unlocking slower?

[AC Question]

My Samsung galaxy 4 has always unlocked instantly when I do my pattern password but just recently that has not been the case. My phone, after I enter the pattern, is taking about 5-10 seconds to open up like it is frozen. After the wait it unlocks like normal but it concerns me that it started doing this

 

[B. Diddy]

Welcome to Android Central! Does this persist after a reboot? How about a cache partition wipe? http://support.t-mobile.com/docs/DOC-5744