Description of problem:
If I copy a very large file (say a video - something bigger than around 600Mb)
from one drive to another, nautilus claims upwards of 70% processor time. Once
the copy has finished, it remains at that level. If I kill nautilus, the
processor use reverts to normal.

Version-Release number of selected component (if applicable):
2.16.0-4

How reproducible:
Always

Steps to Reproduce:
1. Create an ISO image to drive "a" - ensure it's 650Mb
2. Copy from one drive to another
3.
  
Actual results:
Processor time increases alot towards 500Mb and stays high at the end.

Expected results:
After the copy, processor use should revert to normal.

Additional info: