Doubts in running a scene


I have some scenes an triggers to it.

If some of my lights are on, i have a scene that turn everything off.
It’s programmed without luup codes. only at ui5.
When i press this scene, i noticed that for about 30 sec / 1 minute i cannot do basically nothing because all my devices are with the status: “trying to send again with ack”
Why there is this delay running scenes?

1-Is there something i can do to turn this process quickly?
2-If i program with luup codes it will be the same?

(about 2 weeks ago i have clicked on “repair zwave network”)
but aparrently nothing changed.