Years ago I got interested in D. It's a great language, but at the time its garbage collector was leaky. There weren't any D entries on the Benchmarks Game back then, so I ported most of the programs to D and optimized them as best I could as a newcomer. Performance wise, D was in the C/Rust/C++ range and in many cases it even beat Rust and C++. I tried to get the community involved to help the language gain wider adoption, but nothing really happened. I think everything has its moment, and D's moment has passed. They didn't make the most of the window when D could have gone mainstream.