See comment about regexes: However, D's compile-time metaprogramming facilities allowed us to get ambitious in some places... for instance, std.uni precomputes

See comment about regexes: However, D's compile-time metaprogramming facilities allowed us to get ambitious in some places... for instance, std.uni precomputes some Unicode lookup tables during compilation, and std.regex makes heavy use of metaprogramming to compile regular expression strings to D code, again during compilation. As a result, making use of those features will result in heavier load on the compiler. https://news.ycombinator.com/item?id=18502101 https://news.ycombinator.com/item?id=18502101