why is my samsung galaxy s5 taking so long to start up?

[AC Question]

Hey adroid central! I have a samsung galaxy s5, about a year old, t mobile send me an update to lillipop, after the update my phone got kinda slow, and often freeze, other than those my main concern is that it takes sometime for it to totaly start, after i hit power button it says "android starting, optimizing app 1 of 1" and it takes about 2-3mins and it bothers me a lot, i already did the cache partition clearing but still it did'nt solve the problem. Need help guys, please! Thank you!

 

[YerE]

Please help guys! Need badly

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