One of the first things I noticed when I loaded Unity on my ‘production’ laptop was that the active window shadows were HUGE. I figured I could just use gconf-editor to fix these, but I found that they were part of the ambiance theme, not part of compiz. Here is what I did to tame the shadows. Open a terminal and complete the following:
sudo nano metacity-theme-1.xml
Find the line (use cntl+w) that says:
<shadow radius=”45.0″ opacity=”0.75″ color=”#abde4f” x_offset=”1″ y_offset=”4″/>
Change the radius to a value you can deal with… I chose 10.