From a C++/JS benchmark

[Trass3r]

C++:
Skinned vertices per second: 48660000

C++ no SIMD:
Skinned vertices per second: 42420000


D dmd:
Skinned vertices per second: 159046

D gdc:
Skinned vertices per second: 23450000



Compilers:

gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)
g++ -s -O3 -mfpmath=sse -ffast-math -march=native

DMD64 D Compiler v2.054
dmd -O -noboundscheck -inline -release dver.d

gcc version 4.6.1 20110627 (gdc 0.30, using dmd 2.054) (GCC)
gdc -s -O3 -mfpmath=sse -ffast-math -march=native dver.d


Ubuntu 11.04 x64
Core2 Duo E6300