diff --git a/homeassistant/__init__.py b/homeassistant/__init__.py
index a51bb6b47a8..96d24cb62cf 100644
--- a/homeassistant/__init__.py
+++ b/homeassistant/__init__.py
@@ -27,7 +27,7 @@ import homeassistant.util as util
 DOMAIN = "homeassistant"
 
 # How often time_changed event should fire
-TIMER_INTERVAL = 3  # seconds
+TIMER_INTERVAL = 1  # seconds
 
 # How long we wait for the result of a service call
 SERVICE_CALL_LIMIT = 10  # seconds
diff --git a/homeassistant/components/chromecast.py b/homeassistant/components/chromecast.py
index 2f619007365..b628a21e97c 100644
--- a/homeassistant/components/chromecast.py
+++ b/homeassistant/components/chromecast.py
@@ -297,7 +297,7 @@ def setup(hass, config):
                 pychromecast.play_youtube_video(video_id, cast.host)
                 update_chromecast_state(entity_id, cast)
 
-    hass.track_time_change(update_chromecast_states, second=[0, 15, 30, 45])
+    hass.track_time_change(update_chromecast_states, second=range(0, 60, 15))
 
     hass.services.register(DOMAIN, SERVICE_TURN_OFF,
                            turn_off_service)
diff --git a/homeassistant/components/device_tracker/__init__.py b/homeassistant/components/device_tracker/__init__.py
index 009cf15ad20..10efdf8c840 100644
--- a/homeassistant/components/device_tracker/__init__.py
+++ b/homeassistant/components/device_tracker/__init__.py
@@ -127,7 +127,7 @@ class DeviceTracker(object):
             return
 
         hass.track_time_change(
-            update_device_state, second=[0, 12, 24, 36, 48])
+            update_device_state, second=range(0, 60, 12))
 
         hass.services.register(DOMAIN,
                                SERVICE_DEVICE_TRACKER_RELOAD,
diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index 91d4cec9236..daf0945e289 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -83,6 +83,7 @@ def setup(hass, config):
 
     discovery.listen(hass, DISCOVERY_PLATFORMS.keys(), sensor_discovered)
 
-    hass.track_time_change(update_sensor_states)
+    # Fire every 3 seconds
+    hass.track_time_change(update_sensor_states, seconds=range(0, 60, 3))
 
     return True