My thoughts...nothing. Gotta let her render. Had one similar where I followed that break taking rain tutorial and took like 2 hours for a minute or so. I have an Intel I7, with 36 GB RAM, 2GB Video Card, and that military grade TUFF motherboard.
Just make sure you got it right. :) I suppose using a proxy early on if it works might save time but that requires that piece to be where you want it (I think - not the expert on proxies).
Eric