$ time python /tmp/my.py 0

real	0m0.011s
user	0m0.008s
sys	0m0.000s
$ time python /tmp/my.py 0 cloudinit

real	0m0.013s
user	0m0.008s
sys	0m0.004s
$ time python /tmp/my.py 1 cloudinit

real	0m0.316s
user	0m0.300s
sys	0m0.016s
$ time python /tmp/my.py 10 cloudinit

real	0m0.322s
user	0m0.308s
sys	0m0.012s
$ time python3 /tmp/my.py 0 cloudinit

real	0m0.029s
user	0m0.028s
sys	0m0.000s
$ time python3 /tmp/my.py 1 cloudinit

real	0m0.268s
user	0m0.256s
sys	0m0.008s
$ time python3 /tmp/my.py 10 cloudinit

real	0m0.264s
user	0m0.256s
sys	0m0.008s
$ cat /tmp/my.py 
#!/usr/bin/python

def iter_entry_points(namespace, loader=None, name=None):
    for e in pkg_resources.iter_entry_points(namespace, name=name):
        if loader is None:
            thing = e.load()
        else:
            thing = loader(e)
        if thing is not None:
            yield (e.name, thing)

if __name__ == '__main__':
    import sys
    numloops = int(sys.argv[1])
    args = sys.argv[2:]
    if numloops == 0:
        sys.exit(0)
    import pkg_resources
    for i in range(0, numloops):
        for entry in iter_entry_points(*args):
            print("entry: %s" % entry)