Slow when expanding

[georgekfoury]

I have around 100 items in the collectionview with picture and text. When calling self.toggleExpansionForSectionAtIndex(recognizer.section, animated: true, withDuration: 0.5);, if there are 10,20 items in the expanded section it's fine. When it contains 100 it takes around 1.5 seconds which is laggy for the user. Any solutions? (Maybe because each time i expand, the whole collectionview loads?) Thank you!