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I have just created a UICollectionView in which The user can add images from their phone to the photo album feature in the app. I have the images save to the a subdirectory in the documents directory so more can be added and removed. However, when I scroll up and down the collection view, it is very laggy. How can I make the scroll nice and smooth? My Code: The first 16 images are preset images everything after that are from a subdirectory in documents Directory - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { CollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Custom" forIndexPath:indexPath]; //Current index number int index=indexPath.section * noOfSection + indexPath.row; //Check if its the preset photos if(index<16){ NSString *name=[recipePhotos objectAtIndex:indexPath.section * noOfSection + indexPath.row]; cell.imageView.image=[UIImage imageNamed:name]; } //not preset photos, so retrieve the photos the user added else { NSData *data= [NSData dataWithContentsOfFile:[recipePhotos objectAtIndex:index]]; UIImage *theImage=[UIImage imageWithData:data]; cell.imageView.image=theImage; data=nil; } return cell; } Time Profiler gave me this Running Time Self Symbol Name 568.0ms 63.1% 0.0 Main Thread 0x4048 320.0ms 35.5% 0.0 _pthread_start 0x405e 320.0ms 35.5% 0.0 thread_start 320.0ms 35.5% 0.0 _pthread_start 320.0ms 35.5% 0.0 0x1084be960 310.0ms 34.4% 1.0 0x1084be6f0 7.0ms 0.7% 0.0 mach_msg 2.0ms 0.2% 2.0 objc_msgSend 1.0ms 0.1% 1.0 -[NSAutoreleasePool release] 4.0ms 0.4% 0.0 _dispatch_mgr_thread 0x4052 4.0ms 0.4% 0.0 _dispatch_mgr_thread 4.0ms 0.4% 0.0 _

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