new_contents: #!/usr/bin/env python
  
  """Test times and sizes of some particularly large or difficult tiles."""
  
  import requests, time, grequests
  
  urlbase = 'http://127.0.0.1:8000'
  for spot in ('7/25/49', '6/13/23', '5/6/11', '5/7/12', '4/3/6'):
      url = "{}/mergedRivers/{}.json".format(urlbase, spot);
      start = time.time()
      r = requests.get(url)
      l = len(r.content);
      end = time.time()
      j = r.json()
  
      assert r.status_code == 200
      print "{:>8}: {:6.0f} ms {:6.0f} kb {:>6} features".format(spot, 1000*(end-start), l/1024, len(j['features']))
  
subject: check in a second test client