Slow automation with two media players volume

I have some ceiling spekaers which has separate volume than my TV. Tv is connected with them via optic audio cable.

I want when I press on my tv’s remote volume up/down/mute, to be fast enough to setup those ceiling speakers.

Currently I have this automation which does work, but slow - I need to wait like 10 seconds to setup volume on my ceiling spekaers.

- alias: 'Sync volume bedroom speakers ceiling and tv'
  mode: parallel
  trigger:
  - platform: state
    entity_id: media_player.bedroom_tv, media_player.bedroom_ceiling_speaker
    attribute: volume_level
  condition:
    condition: and
    conditions:
      - condition: state
        entity_id: media_player.bedroom_tv
        state: "on"
      - condition: state
        entity_id: "media_player.bedroom_ceiling_speaker"
        state: "on"
  action:
  - variables:
      vol_from: "{{ trigger.from_state.attributes.volume_level }}" 
      vol_to: "{{ trigger.to_state.attributes.volume_level }}" 
  - service: media_player.volume_set
    data:
      entity_id: media_player.bedroom_tv, media_player.bedroom_ceiling_speaker
      volume_level: >
        {% set volumes =  state_attr('media_player.bedroom_tv', 'volume_level'),
                          state_attr('media_player.bedroom_ceiling_speaker', 'volume_level') %}
        {% if vol_to|float > vol_from|float %}
          {{ (volumes|max)|float }}
        {% else %}
          {{ (volumes|min)|float  }}
        {% endif %}

Try mode: single. I think your actions are re-triggering the automation which could be slowing things down.

Also if you only adjust the tv volume as per your description you could simplify it to this and see if it is any faster:

- alias: 'Sync bedroom speakers ceiling to tv volume'
  mode: single
  trigger:
  - platform: state
    entity_id: media_player.bedroom_tv
    attribute: volume_level
  condition:
    condition: and
    conditions:
      - condition: state
        entity_id: media_player.bedroom_tv
        state: "on"
      - condition: state
        entity_id: "media_player.bedroom_ceiling_speaker"
        state: "on"
  action:
  - service: media_player.volume_set
    data:
      entity_id: media_player.bedroom_ceiling_speaker
      volume_level: "{{ state_attr('media_player.bedroom_tv', 'volume_level') }}"