No, it would most likely run worse. The reason being that computers now have caching systems built in, and caching is many many times faster than reading from disk. If you use multiple directories, you prevent the caching systems from being used efficiently.
Some people claim to see better performance with 2 directories, but the only way that can happen is if it's on 2 separate hard drives on separate IDE channels (assuming theyre IDE). Otherwise, its fighting for the same resources anyway. And this isn't likely to be faster if you have a hard drive bigger than ... i dont know, a few gigabytes (newer hard drives all have fairly big cache, an old cheapo 30GB Maxtor has 2MB, and some now even have 8MB).. or if you have Windows XP. If you have really old 7200rpm hard drives, say .. 5+ years.. and Windows 98/ME, you could possibly see a gain with the case explained above
