Feq questions about the D language

[DFGH]

I'm a C# programmer who wants to start using D as well for 
various reasons. Is the official D compiler(DMD) matured enough 
to be used for writing 'heavy' applications? I mean, there is a 
bug tracker section for the compiler on this website and there 
are many 'major' and 'critical' bugs listed there and i'm not 
sure how much should i be concerned about them. I played with D 
for a while and it feels a lot like C# which is obviously good 
for me. What about performance? Yeah, i know that D is a native 
language and theoretically should be faster than C#, but it's all 
about compiler/runtime implementations. The Microsoft's .NET 
implementation nowadays produces extremely fast code. So, 
performance is definetely NOT one of the reasons for using D. 
Achieving similar performance in D compared to C# would be good 
enough for me. Also i need a portable graphic library for drawing 
2D primitives. In C# there is a .NET wrapper around 
GDI+(System.Drawing namespace) and it's super easy to draw 
things. I have a large GUI application written in C# and i want 
to rewrite it in D. Is there something like the System.Drawing 
available? I don't need a heavy framework/api that's used for 
drawing UI elements(buttons, panels, etc.) like QT, GTK+ or 
something like that, but a library for drawing primitive objects 
on the screen. I have drawn almost all the controls in my 
application using System.Drawing because i'm not happy with some 
of the built-in controls offered by .NET(which also have some 
bugs). So, do you know such library?