Oh, sorry, it works now, but the image does not show immediately, it needs to wait for long time.
How to make the image show immediate after uploaded?
Do you mean that you handle onuploadcomplete event by a4J:support and reRender something with images?
Try to add alert for onuploadcomplete attribute in fileupload. If it pops up immediately after upload then this is not a fileUpload issue. Try to clear up why request for getting images processes so long.