I've only used it within XCode so can't say which is to blame, but I did frequently get the message "The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions" which seems to be a problem with the language/compiler/type system, not XCode per se

I agree with this, i've been avoiding xcode as much as possible for my little swift projects, but now I do wonder if that still stands for large codebases, I guess you could try and find some big codebases on swift on gh and see how much it takes to compile