Yes the operation is quite efficient, the problem is that fork() normally makes reloading of code (without resorting to special tricks) impossible, as the inter

Yes the operation is quite efficient, the problem is that fork() normally makes reloading of code (without resorting to special tricks) impossible, as the interpreter will usually already have loaded all imports before forking. The only way to circumvent this would be to delay the loading of required modules until after the fork.