core: A lot of "is taking over 10 seconds" and "took longer than the scheduled update interval" errors in > 0.78

Home Assistant release with the issue:

0.79

Last working Home Assistant release (if known): 0.68

Operating environment (Hass.io/Docker/Windows/etc.):

Hassbian on RPI3

Component/platform:

Description of problem: Getting a lot of timeout errors in log after upgrading from 0.68 to 0.78. It seems to be coming each minute or so in the error log. See a bit of the error log below.

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

Traceback (if applicable):

018-09-29 23:08:00 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:06 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:07 WARNING (MainThread) [homeassistant.components.sensor] Updating command_line sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:07 WARNING (MainThread) [homeassistant.components.sensor] Updating speedtest sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:08 WARNING (MainThread) [homeassistant.components.sensor] Updating systemmonitor sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:08 WARNING (MainThread) [homeassistant.components.media_player] Updating sonos media_player took longer than the scheduled update interval 0:00:10
2018-09-29 23:08:09 WARNING (MainThread) [homeassistant.components.sensor] Updating netatmo sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:12 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:17 WARNING (MainThread) [homeassistant.components.sensor] Updating ios sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:18 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:19 WARNING (MainThread) [homeassistant.components.media_player] Updating sonos media_player took longer than the scheduled update interval 0:00:10
2018-09-29 23:08:24 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:30 WARNING (MainThread) [homeassistant.components.media_player] Updating sonos media_player took longer than the scheduled update interval 0:00:10
2018-09-29 23:08:30 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:36 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:38 WARNING (MainThread) [homeassistant.components.sensor] Updating command_line sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:38 WARNING (MainThread) [homeassistant.components.sensor] Updating speedtest sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:39 WARNING (MainThread) [homeassistant.components.sensor] Updating systemmonitor sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:40 WARNING (MainThread) [homeassistant.components.sensor] Updating netatmo sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:41 WARNING (MainThread) [homeassistant.components.media_player] Updating sonos media_player took longer than the scheduled update interval 0:00:10
2018-09-29 23:08:42 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:48 WARNING (MainThread) [homeassistant.components.sensor] Updating ios sensor took longer than the scheduled update interval 0:00:30
2018-09-29 23:08:48 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:08:52 WARNING (MainThread) [homeassistant.components.media_player] Updating sonos media_player took longer than the scheduled update interval 0:00:10
2018-09-29 23:08:54 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:09:03 WARNING (MainThread) [homeassistant.components.media_player] Updating sonos media_player took longer than the scheduled update interval 0:00:10
2018-09-29 23:09:06 WARNING (MainThread) [homeassistant.components.sensor] Updating rest sensor took longer than the scheduled update interval 0:00:05
2018-09-29 23:09:06 WARNING (MainThread) [homeassistant.helpers.entity] Update of sensor.XXX_iphone_battery_state is taking over 10 seconds
2018-09-29 23:09:06 WARNING (MainThread) [homeassistant.helpers.entity] Update of sensor.speedtest_ping is taking over 10 seconds
2018-09-29 23:09:06 WARNING (MainThread) [homeassistant.helpers.entity] Update of sensor.memory_use_percent is taking over 10 seconds
2018-09-29 23:09:06 WARNING (MainThread) [homeassistant.helpers.entity] Update of sensor.netatmo_innesensor_pressure is taking over 10 seconds
2018-09-29 23:09:06 WARNING (MainThread) [homeassistant.helpers.entity] Update of media_player.stue is taking over 10 seconds

Additional information: