Since the loading movie with percentage or progress bar rely on number of frames loaded one thing you can do to improve the accuracy is to simply remove empty frames. This spreads your content out over the total number of frames rather than in the first few only.
I know I was guilty of being lazy and not always trimming empty frames especially at the end of my movies. But having started to do so mainly to squeeze my files sizes down, I found this helped the loading movies show better results.
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