Uwsgi + django slow respawn / reload / restart

I am using django 1.7.7 and uswgi 2.0.7 on debian jessie

Uwsgi is very slow to restart / reload / restart. It seems to reach a timeout (30 seconds).

Fri Jul 31 08:20:59 2015 - SIGINT/SIGQUIT received...killing workers...  
Fri Jul 31 10:21:29 2015 - *** Starting uWSGI 2.0.7-debian (64bit) on [Fri Jul 31 10:21:29 2015] ***

Fri Jul 31 09:25:53 2015 - SIGINT/SIGQUIT received...killing workers...  
Fri Jul 31 11:26:24 2015 - *** Starting uWSGI 2.0.7-debian (64bit) on [Fri Jul 31 11:26:24 2015] ***

      

        
        
        
      

    

I have a problem with two versions of the uwsgi ini file. First like describe (django doc) :

 # Django wsgi file
 module          = ntbserver.wsgi:application

      

        
        
        
      

    

and seconde as described here (uwsgi doc)

# Django wsgi file
module          = ntbserver.wsgi

      

        
        
        
      

    

I found the third version at turorials. If I do this:

# Django wsgi file
module          = django.core.handlers.wsgi:WSGIHandler()

      

        
        
        
      

    

He instantly

Fri Jul 31 11:25:46 2015 - SIGINT/SIGQUIT received...killing workers...  
Fri Jul 31 11:25:47 2015 - worker 1 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 2 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 3 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 4 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 5 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 6 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 7 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 8 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 9 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - worker 10 buried after 1 seconds
Fri Jul 31 11:25:47 2015 - goodbye to uWSGI.
Fri Jul 31 11:25:47 2015 - VACUUM: pidfile removed.
Fri Jul 31 11:25:47 2015 - VACUUM WARNING: unix socket /run/uwsgi/app/ntbserver/socket changed inode. Skip removal
Fri Jul 31 11:25:48 2015 - *** Starting uWSGI 2.0.7-debian (64bit) on [Fri Jul 31 11:25:48 2015] ***

      

        
        
        
      

    

But I don't understand the difference and the impact of this change. I can't find any documentation or guidelines on this. If anyone can help me.