Ok, maybe we are on to something:

I have folder ~/Documents  with 20 items total of which 11 folder
I have  ~/Documents/MyDrawings  with 10 files a few images, a few doc files

Test A

1  ~/Documents is in List mode - Clicking on MyDrawings takes 5 seconds to 
open.  MyDrawings is in *icon* mode
2  going back to ~/Documents takes again 5 seconds

On system monitor I see hardly disk activity.  The CPU (i5) occupies ALL
cores. RAM uses is <25% (1 of 4GB)

Test B
 
1  ~/Documents I put in Icon mode - Clicking on MyDrawings takes *still* 5 
seconds to open.  MyDrawings is still in icon mode
2  going back to ~/Documents is Fast !
3 - again clicking on MyDrawings is Fast !

Conclusion, we have some weird behavior:

a. Switching *to* AND *from* a folder in List mode is slow. You would
argue, that switching FROM a folder in List mode should be same as
switching FROM a folder in Icon mode, but that is not the case. Leaving
a folder kills the CPU !

b. All folders in Icon mode is fast.

c. as said before, using filebrowser in list mode is always fast, no
problems showing file details like sizes, icons and so on !

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https://bugs.launchpad.net/bugs/1001578

Title:
  Nautilus on SSD is slower than on external HDD

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