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I use Astro Photography Tool, there is a thread that is always updated (I am terrible at searching for these). Anyway it will load the image reasonably fast for me, update preview is ready for me to view by the time the camera is taking the next shot 5 seconds later. The images need to be set for Raw and JPG for this to work. I am very happy with the software and includes many feature over an above the EOS utility. The Focus assist is really cool although this is for the paid version.
There is a free version still with a lot of features to try it out.
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