Haneke doesn't resize images in background?

[mixtly87]

Am I missing something or Haneke actually does NOT resize network-retrieved images on the background, but performs the resizing on the main thread.

I noticed my scroll performance on UITableView stutters and profiling led to hnk_imageByScalingToSize being called on main thread.

I ended up adding dispatch_async to - (BOOL)fetchImageForFetcher:formatName:success:failure:

- (BOOL)fetchImageForFetcher:(id<HNKFetcher>)fetcher formatName:(NSString *)formatName success:(void (^)(UIImage *image))successBlock failure:(void (^)(NSError *error))failureBlock
{
    NSString *key = fetcher.key;
    return [self fetchImageForKey:key formatName:formatName success:^(UIImage *image) {
        if (successBlock) successBlock(image);
    } failure:^(NSError *error) {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            HNKCacheFormat *format = _formats[formatName];

            [self fetchImageFromFetcher:fetcher completionBlock:^(UIImage *originalImage, NSError *error) {
                if (!originalImage)
                {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        if (failureBlock) failureBlock(error);
                    });
                    return;
                }

                dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                    UIImage* image = [self imageFromOriginal:originalImage key:key format:format];
                    [self setDiskImage:image forKey:key format:format];
                    dispatch_async(dispatch_get_main_queue(), ^{
                        [self setMemoryImage:image forKey:key format:format];
                        if (successBlock)
                        {successBlock(image);}
                    });
                });
            }];
        });
    }];
}

I'm not sure if this is a no-no for any reason. I was surprised to see that images are resized on the main queue, when one of the stated features is 'Background image resizing and file reading.'