Concurrent futures threading running at same speed as non-threading

[buran]

import concurrent.futures
from concurrent.futures import ThreadPoolExecutor

def add(args):
    print('inside add')
    return sum(args)

args = [(4, 2), (9, 3), (16, 2)]

with ThreadPoolExecutor(max_workers=5) as executor:
    for result in executor.map(add, args):
        print(result)

Output:
inside add
inside add
6
inside add
12
18