UICollectionview Scrolling choppy when loading cells

So anybody having scrolling issues should do this

add these 2 lines after your dequeue

cell.layer.shouldRasterize = YES;cell.layer.rasterizationScale = [UIScreen mainScreen].scale;

I would assume the "choppyness" is coming from the UIImage allocation, not anything with the dequeueReusableCellWithReuseIdentifier method. I'd try doing the image allocation on a background thread and see if that makes things a little more buttery.

-(UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{  mycell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^(void) {     // Load image on a non-ui-blocking thread    UIImage *image = [[UIImage imageWithCGImage:[alassetList objectAtIndex:indexpath.row] thumbnail]];    dispatch_sync(dispatch_get_main_queue(), ^(void) {        // Assign image back on the main thread        mycell.imageView.image = image;    });  });  return mycell;}

More details can be found here: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/Multithreading/Introduction/Introduction.html

Load your images using NSURLConnection's sendAsynchronousRequest:queue:completionHandler:

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {    [cell.imageView setImage:[UIImage imageWithData:data]];}];