Why is D Slow?

[max haughton]

On Wednesday, 26 July 2023 at 07:44:35 UTC, Dlang Lover wrote:
> I've been reviewing most Benchmark tests lately. However, 
> system programming languages ​​such as Rust and C++ promise 
> high speed in almost every field. But I can't see that for D 
> language. For example, does it make sense for a Web Framework 
> to have such a speed issue between Rust and D? Why is there 
> such a speed difference?
>
> [...]

By the looks of it none of the D dub files that I looked had been 
tweaked for performance whereas the competing of rust ones had 
been.