I have a lot of canon raw (CR2) photos. They live on an nfs attached NAS device. When page through my albums, the first time takes a long time - 30 minutes is not unusual. I have selected the option to use the 1st alphabetical entry in albums for the thumb. Having a look at the code it seems that it do the cr2->png conversion for the thumb on every picture in the album before it decides it only wants the first one. This is done be the call to getImages in getAlbumThumbImage. Also it doesn't seem to cache the results, so visiting the album causes the thumbnails to be generated again.
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