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A 10-30% performance hit?
According to a developer at Unsanity, the Mach-O application binary interface (ABI) used in OS X comes straight and unaltered from OpenStep where it was optimised for CISC processors.
But the PowerPC is a RISC processor, and it does not have the facilities needed to implement this ABI correctly, and the workarounds result in a significant performance hit.
The disclosure has already made the rounds of the discussion forums.
MacAddict - MacCentral - MacNN - MacSlash - OSNews - Slashdot - Unsanity