Please describe the problem:
When thumbnailing a large animated gif (4 MB), Nautilus began to consume all the
memory available on my system. Of course, then my system slowed to a halt.

Steps to reproduce:
1. Download the animated gif at http://qub333.googlepages.com/deskbar-demo.gif
2. Open the directory where the gif was stored
3. Watch on top on a old tty terminal as nautilus's memory usage increases very
quickly.


Actual results:
My system is no longer usable. I must kill Nautilus and remove the problematic
file to regain a usable system. 

Expected results:
A nice thumbnail to be generated and still have a usable system.

Does this happen every time?
Yes, everytime. It was worse for me because I had the gif in my home directory.
So when I started back up after a hard shutdown Nautilus showed me my home
directory...

Other information: