Slight delay before image blurred

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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: enter image description here

... then finally blurs after a second: enter image description here

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matt On BEST ANSWER

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.