Do you use D's GC?

[Kirill]

It's interesting to hear do you use D's GC? Or do you use your 
own custom memory management structure?

How performant is GC?

The reason I'm asking is I'm planning to dive into 3D game dev 
with D as a hobby in an attempt to create a game I dreamed of 
since I was a kid. I'd like to know if GC is worth using at all, 
or should I go with 100% manual memory management.

Any opinion is appreciated. Thanks in advance.