Looks like it includes the new faster Squirrelfish engine which apparently is to be integrated into 10.6 safari. I am using it now and Wow! it is a lot faster than any browser I've ever used before.

http://www.tuaw.com/2008/06/05/squirrelfish-could-make-safari-a-lot-faster/

Hi crencom,
thank you, I downloaded and tested it.

Same experience here - very fast page rendering. Love it.

Safari 4 is on the bay too now
That is the version that will be included with 10.6 Snow Leopard

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Mac Inspiron 531 » 10.6.8 • 10.8.0 Legacy Kernel • AMD Athlon 64 X2 5000+ (2.60GHz)
Dell M2N61-AX/nForce 430/MCP61 • 4GB Dual Channel DDR2 667MHz
ALC888 • nVidia GeForce 8600 GT 256 MB
2 x WDC WD5000AAKS 500 GB SATA HDD