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If you use LDC or GDC, the code generation for D is the same as for C and C++, if the code is written the same way.

The code generation for DMD has fallen a bit behind, mostly because I spend my time on other issues these days :-(

>because it's slow

Where do people get this from? D compiles down to the same machine code that every other compiled language does and it has similar language semantics to C++. In some cases D is _faster_ because its richer type and effect systems allow for more opportunities for optimization.

D uses the GC by default - it's not required. As for speed, it's the same as C++.