Python: Pyppeteer with asyncio

I was doing some tests and I wonder if the script below is running asynchronously?

# python test.py  It took 1.3439464569091797 seconds.

31 (sites) x 1.34 = 41.54s - so it's a few seconds less but in theory it should take only as long as the longest request?

# python test.py  It took 28.129364728927612 seconds.

Perhaps opening a browser is not async here and I should use executor for this?

# cat test.py 
import asyncio
import time

from pyppeteer import launch
from urllib.parse import urlparse

WEBSITE_LIST = [
    'http://envato.com',
    'http://amazon.co.uk',
    'http://amazon.com',
    'http://facebook.com',
    'http://google.com',
    'http://google.fr',
    'http://google.es',
    'http://google.co.uk',
    'http://internet.org',
    'http://gmail.com',
    'http://stackoverflow.com',
    'http://github.com',
    'http://heroku.com',
    'http://djangoproject.com',
    'http://rubyonrails.org',
    'http://basecamp.com',
    'http://trello.com',
    'http://yiiframework.com',
    'http://shopify.com',
    'http://airbnb.com',
    'http://instagram.com',
    'http://snapchat.com',
    'http://youtube.com',
    'http://baidu.com',
    'http://yahoo.com',
    'http://live.com',
    'http://linkedin.com',
    'http://yandex.ru',
    'http://netflix.com',
    'http://wordpress.com',
    'http://bing.com',
]

start = time.time()

async def fetch(url):
    browser = await launch(headless=True, args=['--no-sandbox'])
    page = await browser.newPage()
    await page.goto(f'{url}', {'waitUntil': 'load'})
    await page.screenshot({'path': f'img/{urlparse(url)[1]}.png'})
    await browser.close()

async def run():
    tasks = []

    for url in WEBSITE_LIST:
        task = asyncio.ensure_future(fetch(url))
        tasks.append(task)

    responses = await asyncio.gather(*tasks)
    #print(responses)

#asyncio.get_event_loop().run_until_complete(fetch('http://yahoo.com'))
loop = asyncio.get_event_loop()
future = asyncio.ensure_future(run())
loop.run_until_complete(future)

print(f'It took {time.time()-start} seconds.')