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See http://forum.kde.org/viewtopic.php?f=138&t=95551 for a nice example.
*** Bug 297252 has been marked as a duplicate of this bug. ***
Also http://lists.kde.org/?l=kde-kimageshop&m=136895349530381&w=2
So, what is photoshop doing here... Keeping the image data compressed in memory or working on a mipmap with the true size swapped out and the actions stored and applied only in the background? I really wish we knew.
Well, it's an ongoing effort, but there is nothing specific left to do here, so closing.