for counter, (desc, text) in enumerate(reader):
                     receive_time = perf_counter()
                     text = text.strip()
-                    print('{1}: received text "{0}"'.format(text, counter))
+                    print('{1}: received text "{0}" at {2}'
+                          .format(text, counter, receive_time))
                     index = text.index(':')
                     count_text = int(text[:index].strip())
                     self.assertEqual(count_text, counter)
                     if counter == n_texts-1:
                         print('stop since have {0} reads'.format(counter))
                         break
-            print('time diffs in us: {0}'.format(time_diffs))
-            self.assertTrue(max(time_diffs) < 1500., 'read took more than 1.5ms!')
+            print('time diffs in ms: {0}'.format(time_diffs))
+            self.assertTrue(max(time_diffs) < 1000.,
+                            'read took more than 1ms (max was {0:.3f}ms)!'
+                            .format(max(time_diffs)))
 
     def test_line_read(self):
         """ write partial lines, full lines and multiple lines """