Single-threaded Go programs also run faster for some (many?) cases. The runtime is able to bypass a number of locks when running in a single-threaded mode. An

Single-threaded Go programs also run faster for some (many?) cases. The runtime is able to bypass a number of locks when running in a single-threaded mode. And depending on the profile of your code, turning on multiple threads for a Go program can slow it down even if you use channels (as moving data from one CPU core to another can be much slower than just doing a context switch in a single core).