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https://issues.apache.org/jira/browse/NIFI-14708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18004454#comment-18004454
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Joe Witt commented on NIFI-14708:
---------------------------------

Yep agree with Michael here.  I use run once all the time in 2.x and it is 
instantaneous just as it was in the 1.x line.  I think the most likely scenario 
here is as noted which is you're just needing to hit refresh to get the 
absolute latest stats changes.  This is different than it was in earlier 1.x 
lines.

Thanks

> Run Once Is Very Slow
> ---------------------
>
>                 Key: NIFI-14708
>                 URL: https://issues.apache.org/jira/browse/NIFI-14708
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework, Core UI
>    Affects Versions: 2.4.0
>            Reporter: Cemre Mengu
>            Priority: Minor
>         Attachments: Recording 2025-07-03 143959.mp4
>
>
> RunOnce generally on any processor takes about 20 seconds. I have attached a 
> video showing me doing it from GenerateFlowFile processor.
> This was not the case for 1.x versions. I am not sure if it is related but 
> starting & stopping processors also takes a lot of time now (around 5-6 
> seconds).
> Any known issues or workarounds about this? Although I consider it a minor 
> issue since it doesn't prevent us from using the system, it is really 
> annoying when dealing with a lot of processors.



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