The compilation time is slower, not the resulting compiled binary.
> On average the programs in the Go 1 benchmark suite run a few percent faster in Go 1.5 than they did in Go 1.4, while as mentioned above the garbage collector's pauses are dramatically shorter, and almost always under 10 milliseconds.
Python caches the bytecode in .pyc files, so the compilation happens only the first time you import a module. In a typical Python start-up only the main source file is byte-compiled.
> On average the programs in the Go 1 benchmark suite run a few percent faster in Go 1.5 than they did in Go 1.4, while as mentioned above the garbage collector's pauses are dramatically shorter, and almost always under 10 milliseconds.