That compile time is Not Great, but 15 seconds for 7700 lines of code isn't even close to "far worse than C++". :P If incremental compilation is showing no benefits whatsoever, then I'm guessing that time is largely attributable to linking (and I tend to doubt that 7700 lines of code is counting the basic third-party libraries that are required to create a crossplatform GUI app (but I'd love to be surprised!), which will contribute to linkage time... LLD please!).