PAL (http://pal.codeplex.com/) is a favorite tool of mine, written by Clint Huffman. I’ve written about it a few times but maybe you weren’t aware that the newest release has multi-threading capability?
It’s no in your face though really, just an option on the last page, the Execute page:
If you assign more than you have cores, your machine will be pretty unusable during the processing of a BLG, but it cuts time down significantly on complex traces. Give it a shot!