Update of sensor is taking over 10 seconds

Hello,

I'm trying to setup the gtfs-rt for the first time in my HA. It can obviously fetch some data from the API but the information it shows is late

I have checked the system time is correct
it shows 'due at' and 'next bus' time stamps correctly but 'due at' is in history
'due in' is always +/- 60 min though the line has bus every +/- 10 min.

Log shows me following warning

WARNING (MainThread) [homeassistant.helpers.entity] Update of sensor.570_at_airport is taking over 10 seconds

sensor config

sensor:
  - platform: gtfs_rt
    trip_update_url: 'https://realtime.hsl.fi/realtime/trip-updates/v2/hsl'
    vehicle_position_url: 'https://realtime.hsl.fi/realtime/vehicle-positions/v2/hsl'
    departures:
    - name: "570 at airport"
      route: 4570
      stopid: 4530259

Any idea how to fix this? All ideas would be appreciated.

zacs / ha-gtfs-rt

Update of sensor is taking over 10 seconds #10