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I have a 500GB spares bundle encrypted disk image that I store on a network drive, that contains around 200 video files (various formats: mov, mp4, mts) in its root level, plus a few subfolders.

Merely mounting the image takes only a couple of seconds. However, when I actually navigate the Finder to list its contents, it takes upwards of 2 minutes, with the Finder becoming unresponsive during that time.

The network connection is otherwise quite fast, with copy operations to/from folders inside the image being at the 1+ MB/sec range.

What can be causing this slowness and how can I work around it?

share|improve this question
I'm pretty sure it's the video thumbnails… – slhck Apr 2 '13 at 10:57
@slhck I don't think so, since even once the file list finally appears many thumbnails aren't showing and gradually they get added asynchronously – GJ. Apr 2 '13 at 14:08

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