python decorator function performance

def timeit(method):
    import time
    def timed(*args, **kw):
        start = time.time()
        print('start method: '+method.__name__ )
        result = method(*args, **kw)
        end = time.time()
        diff = int(end - start)
        print('end method: ' + method.__name__,' elapsed: '+str(diff)+'sec')
        return result
    return timed

@timeit
def test_timeit(x=None):
    import time
    print('something')
    time.sleep(4)
    print('some other thing')
    return None
    
 test_timeit()