Is iTunes 11 faster on Mountain Lion than it is on Snow Leopard?

I really want to get my iTunes going as fast as possible on my computer and wondered if it might run better in a Mountain Lion environment.

Currently running:

MacBook Pro 5,3 (Mid-2009)
Intel Core 2 Duo 2.66 GHz
4GB RAM
10.6.8

iTunes 11.0.1
Library: 75,933 items, 878.4 GB

With music on 2TB External WD My Book Studio connected through Firewire 800. (Not sure what the RPM is but I believe its 7200).

Any help on squeezing the most out of iTunes would be most appreciated!