Your question in the subject makes little sense. CGImageSource is a means to 
create CGImages. Quick Look likely uses both therefore.

Ultimately, you need to test different image loading routes to see which suits 
your needs.

CGImageSourceCreateImageAtIndex
Generates full-size images as fast as it can

QLThumbnailImageCreate
Generates thumbnails
Might have the thumbnail already cached for speed
Is going to spend a little time in cross-process communication
Logs warnings if used on the main thread in my experience
Can handle any file type, not just images

CGImageSourceCreateThumbnailAtIndex
Generates thumbnails
Very fast

On 7 Sep 2012, at 10:21, Oleg Krupnov <oleg.krup...@gmail.com> wrote:

> And what is the fastest method for image loading,
> QLThumbnailImageCreate or CGImageSourceCreateImageAtIndex?
> 
> Thanks!
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