webpage test with python selenium: really slow execution

I wrote, in Python, using Selenium, a very simple test of a webpage

Here the code:

from selenium import webdriver

import unittest from selenium.webdriver.common.keys import Keys

class NewVisitorTest(unittest.TestCase):

def setUp(self):
# cose da fare prima dei test
    self.browser = webdriver.Firefox()  # Opera? credo sia usabile :D

def tearDown(self):
# cose da fare dopo dei test
    self.browser.quit()

def test_yahoo(self):
    # browser = webdriver.Firefox() # Get local session of firefox
    pagina = "http://ift.tt/1yKv6jo"
    self.browser.get(pagina)      # Load page
    self.browser.implicitly_wait(5)    # aspetto si carichi tutta la pagina
                                       # forzando di aspettare 3 s
    assert "Ricordandoti" in self.browser.title


if __name__ == '__main__':  # 7

unittest.main(warnings='ignore')

It works, but it takes almost a minute to be executed:

Running: /home/.../tests/functional_tests_ricord.py (Wed Jan 21 13:32:05 2015)

. ---------------------------------------------------------------------- Ran 1 test in 60.798s

OK

I use ninja IDE to write the code (in a Ubuntu 14.04 machine). This seems to be the reason.

Executing code directly from shell, it takes 20 s

subu@VR46-U:~$ python3 "/home/.../tests/functional_tests_ricord.py"

.

Ran 1 test in 20.865s

OK

What can I do to fast up the execution?

Thanks,

Andrea