Hi @Mohammad_Rahmani - I don’t know exactly what effect setting that to 0 will have. There will, however, still be a delay; this delay is meant to be minimal, and our engineers are always working to minimize the delay further, but there will always be a delay because Zeebe needs to be export the data to Tasklist.
If you absolutely need immediate information, you can create a job worker that listens for user task events. (Here is a forum topic where a user did a similar thing.) There are downsides to this approach, as the same job worker will be invoked for every user task, so your job worker needs to handle all those cases.