Slight delay before image blurred

Question

I'm using LBBlurredImage https://github.com/lukabernardi/LBBlurredImage with this tutorial http://www.raywenderlich.com/55384/ios-7-best-practices-part-1, and was wondering why it takes a second when a UITableViewCell is supposed to blur (when swiping up immediately when the app opens to see the next tableview cell)?

When I swipe up to go to the next table view cell, the background image takes a second to actually blur.

Swipe... hasn't blurred yet:

... then finally blurs after a second:

Answer 1

was wondering why it takes a second when a UITableViewCell is supposed to blur

Because the blur you are using involves a calculation that takes some time to perform.