I am using Gnome Classic in Ubuntu 14.10, with Compiz effects.
Whenever I delete a file in a Nautilus window, the window becomes unresponsive, and goes grey for a few seconds. Then, it returns. It's a very annoying slowdown for such a simple operation.
So far as I can tell, this only happens when deleting files, not with any other operation.
Why is this happening, and, far more importantly, how do I get it so that file deletion is more or less instantaneous, as it has been up until recently. This change may have happened after upgrading to 14.10. I can't be sure, but that's roughly when I started noticing.