How does SL speed up my 1,1 MacBook?

I am getting ready to upgrade to SL and have a question, obviously.
I have heard that SL really speeds processes up and was wondering how. I am guessing that it purges support for PPC.
Is this how it works?
Adam
PS... if so, does it free up disk space during installation?

It is a little more complicated than just removing the code that supports PPC Macs, which does make the OS "footprint" on the drive smaller. Among other things, almost all the core & bundled applications (Finder, Disk Utility, Safari, etc.) have been rewritten as 64 bit applications. Some of the improved performance comes from taking advantage of 64 bit CPU instructions that can move more data per clock cycle, a little from the smaller code. Most of it comes from a fundamental rewrite of everything from the ground up, so to speak.
As Apple says, it is a streamlined, more refined version of Leopard.

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How does SL speed up my 1,1 MacBook?

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