GmpBench

coordinates: deep zoom +132 (768 bits).frs
checksum: 24454011
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machine: ckci-home (Pentium III)
compiler: VC++ 6.0
GMP version: 4.1.2
GMP target: P6
GmpBench: 446.96
Fractice: 445.71

machine: eng-ckorda (2.66 GHz Intel CoreDuo)
compiler: VC++ 6.0
GMP version: 4.1.2 (my port)
GMP target: Pentium4
GmpBench: 106.02, 105.86

machine: eng-ckorda (2.66 GHz Intel CoreDuo)
compiler: .NET 2005
GMP version: 4.1.2 (my port)
GMP target: Pentium4
GmpBench: 105.25, 105.33

machine: eng-ckorda (2.66 GHz Intel CoreDuo)
compiler: .NET 2005
GMP version: 4.2.2 (Gladman's port)
GMP target: Pentium4
GmpBench: 111.29, 111.34

Many differences between Gladman's 4.2 and my 4.1, likely candidates include
config.h (alloc differences!)
gmp-mparams.h
gmp-impl.h
longlong.h (long long is enabled in Gladman but not mine)