This is not only 100% CPU usage, it is also a memory problem. It looks like the 
copy operation wants to acquire the whole file in memory during the copy. This 
is not a serous problem for normal pictures under 20MB, but I just gave up 
copying a 2GB MOV file from a Canon 7D to Ubuntus 10.04 using USB cable. The 
following path was shown in Nautilus:
gphoto2://[usb:001,006]/DCIM/100EOS7D

Related to this bug is that the limitation in when to show preview. When
you disable preview for files over 50MB, this setting is ignores for
files on the digi cam. This is a problem because the transfer rate is
not fast, it takes 100% CPU and takes just as much memory as the size of
the file processed for preview. The only way I found to avoid this, is
to disable preview of other media altogether.

Workaround appears to be to take out the CF anf stuff it directly into
the computer.

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https://bugs.launchpad.net/bugs/653623

Title:
  gvfs-gphoto2 eating 100% CPU and no I/O operations

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