There's a huge difference between C/C++'s malloc() and a precise garbage collector: with the former all objects are fixed. With the latter you can move them aro

There's a huge difference between C/C++'s malloc() and a precise garbage collector: with the former all objects are fixed. With the latter you can move them around. This means malloc() is more constrained than a GC, and that makes it slower. The real gains of managing memory manually is not in the speed of malloc(), but in the fact that in practice you can perform far fewer heap allocations.