The GC and performance, but not what you expect

[Wanderer via Digitalmars-d]

It will be hard to beat Java's garbage collector. They use 
generational, sequential memory approach, while D's memory 
manager (correct me if I'm wrong) uses more common approach and 
has to deal with possible memory fragmentation. Allocating a new 
object is extremely cheap in Java, literally a few machine 
instructions, and there is no locking because each thread has its 
own eden memory and they never overlap.

Unless D introduces the possibility to move objects around in 
heap (which is not possible with the support of pointers, I 
guess) and eliminate the fragmentation, it will be hard to make 
GC as fast. Just 3% of difference look great enough to me. :-)