[ericfrederich]

I did not get as dramatic of results as you.

  # python3 -m venv example
  # source example/bin/activate
  (example) # pip install pyflakes
  Collecting pyflakes
    Downloading pyflakes-1.5.0-py2.py3-none-any.whl (225kB)
      100% || 225kB 892kB/s 
  Installing collected packages: pyflakes
  Successfully installed pyflakes-1.5.0
  (example) # time for i in {00..99}; do python -m pyflakes /dev/null; done
  real    0m7.167s
  user    0m6.407s
  sys 0m0.750s
  (example) # time for i in {00..99}; do pyflakes /dev/null; done
  
  real    0m7.661s
  user    0m6.894s
  sys 0m0.753s

[jwilk]

I guess it gets worse when you have more stuff installed in the environment.