The one pathological case of kinda-slow Go compilation I have involves embedding a very big binary blob (FPGA firmware for a controller chip driving a Texas Instruments DMD array) as a const array of bytes that I can just dump down the usb connection when cold booting the device. I don't fault Go for this as I'm really abusing the language to simplify my single-file deployment without having to do too much work for the simple deploy.

If I wanted to spend the time I could do something like append the blob to the end of the program executable instead of just clumsily jamming it into DATA, but this all exists in a library that doesn't need to change often so the fact that it takes ~10-15 seconds to compile is not a problem in practice.

No, it's closed-source unfortunately. It might be a bit inaccurate as I only measured the includes in my folder and not everything in the src folder, but it only imports from the stdlib and a redis lib.