Blink a LED with Raspberry Pi GPIO for less than a second

Configuration
1

I am trying to blink a LED from a Raspberry Pi GPIO Pin from an Automation.
But the delay is not working, the LED is always on/off for around 1 second instead of the defined 150 milliseconds.

- delay:
    milliseconds: 150

Is it not possible to make it faster than 1 second?

Thats my Automation:

- alias: switch_doorbell_speaker_on_off
  initial_state: True
  hide_entity: False
  trigger:
    - platform: state
      entity_id: 
        - sensor.r433_mhz_hub_doorbell_status
      to: 'ring'
  action:
    - service: switch.turn_on
      entity_id: switch.doorbell_speaker
    - delay:
        milliseconds: 150
    - service: switch.turn_off
      entity_id: switch.doorbell_speaker
    - delay:
        milliseconds: 150
    - service: switch.turn_on
      entity_id: switch.doorbell_speaker
    - delay:
        milliseconds: 150
    - service: switch.turn_off
      entity_id: switch.doorbell_speaker
2

The delay function support for milliseconds is pointless. The service call takes longer than that.

Here’s how I did it: My worst kludge