Nautilus is slow if a lot of images are in a directory

Question

I have 400 images in a directory. I look at the directory with nautilus.

The first time I open the directory it is very slow. I have a modern laptop with 4 cores and plenty of RAM.

My use case:

• open directory containing a lot of images
• press Ctrl++ to make the images larger
• I want to sort the images to some directories, or delete some images.

Result:

• Nautilus is unusably slow. I walked away from the laptop to do different stuff, some time later it was usable.
• Nautilus has 104% CPU in top.
• Low "wait" value in top: Disk is not the bottleneck

Guess:

• Nautilus creates the thumbnails of all images, without nice-level.
• But all thumbnails are not needed at once. I just looked at the first 10 images.
• Nautilus should prefer user input to background thumbnail creation, since user response is more important.
• Multicores hang around idle.

My conclusion:

• if Nautilus would use all cores and with a nice value for background stuff, the user would have better responsiveness and the background job would be quicker.

Question: Is there anything I can do to solve this?

Maybe a configuration which can I set, or create a bug report for the developers?