The script run-and-stop-gunicorn.sh takes 1 second on both Python 2.7 and 3.4.

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.2 LTS"
$ 
$ 
$ source 27-env/bin/activate
(27-env)$ time ./run-and-stop-gunicorn.sh 
[2016-05-09 17:07:16 +0000] [2735] [INFO] Starting gunicorn 19.4.5
[2016-05-09 17:07:16 +0000] [2735] [INFO] Listening at: http://127.0.0.1:8000 (2735)
[2016-05-09 17:07:16 +0000] [2735] [INFO] Using worker: sync
[2016-05-09 17:07:16 +0000] [2741] [INFO] Booting worker with pid: 2741
[2016-05-09 17:07:17 +0000] [2735] [INFO] Handling signal: term
[2016-05-09 17:07:17 +0000] [2741] [INFO] Worker exiting (pid: 2741)
[2016-05-09 17:07:17 +0000] [2735] [INFO] Shutting down: Master

real	0m1.043s
user	0m0.137s
sys	0m0.041s
(27-env)$ deactivate
$ 
$ 
$ source 34-env/bin/activate
(34-env)$ time ./run-and-stop-gunicorn.sh 
[2016-05-09 17:07:31 +0000] [2763] [INFO] Starting gunicorn 19.4.5
[2016-05-09 17:07:31 +0000] [2763] [INFO] Listening at: http://127.0.0.1:8000 (2763)
[2016-05-09 17:07:31 +0000] [2763] [INFO] Using worker: sync
[2016-05-09 17:07:31 +0000] [2767] [INFO] Booting worker with pid: 2767
[2016-05-09 17:07:32 +0000] [2763] [INFO] Handling signal: term
[2016-05-09 17:07:32 +0000] [2767] [INFO] Worker exiting (pid: 2767)
[2016-05-09 17:07:32 +0000] [2763] [INFO] Shutting down: Master

real	0m1.096s
user	0m0.281s
sys	0m0.027s
(34-env)$ deactivate