Why is D significantly slower than C# in this instance?

[ryuukk_]

Please format your code using markdown syntax


```D
// your code here
```


Also please share the  exact code you benchmark, the one you 
shared is incomplete


As other mentioned you are building in debug mode, dmd is not 
suited for performance, it's favors compile speed instead


As other mentioned please use LDC on windows/unix or GDC on unix 
with proper release flag: -O2 for LDC for example