@meta_leap
the transpiling to C or C++ code is actually very fast. Currently there is no
caching on the Nim side so it must be fully transpiled every time, however this
caching feature -- called incremental compilation -- is now in active
development. Expect transpile times to improve in the future 🙂

C++ build times using your compiler of choice remain what they are. However,
purely anecdotally, I've noticed that the Nim version of C++ code compiles
faster than my old hand-written C++ code of the same projects from before I
ported them to Nim. YMMV