I am new at Dlang and I have questions in my head

[Muhammed]

Hello, I have been trying to learn +1 year C and C++ but 
fortunately I gained much experience and I don't have as much 
trouble learning C and C++ as I used to and I think I will be 
good level at C&C++ soon. But also I started to learn Dlang and 
don't misunderstand me, I will use C++ for recquiring a job and I 
love C++ but I started to love too much Dlang.

Here are some questions that are confusing me:

-How high-performing is Dlang really? I saw that in some places 
even C# has surpassed Dlang. C# on 
https://programming-language-benchmarks.vercel.app/. Will be the 
apps(GUI, Web etc) very good quality that I will write with 
Dlang? Like Java and C#?

-Is Dlang excellent language for low level and bare metal? 
Because I am particularly interested in low level apps. For 
example Dlang's inline assembly is excellent quality?

-How should I use it to avoid both a performance drop due to GC 
and sacrificing Dlang's high-level features?

-Is Dlang's GC indeed slower than Java&C#'s GC?


These are my only questions and as I said, I like both C++ and 
Dlang; I don't find using either of them difficult.