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If a local agent is running connected to a remote prefect server, and prefect ui shows the agent is indeed active, what could be the reason for a late flow when using "quick run"?

In my experience, it's usually due to label mismatch between the flow/flow run and the agent.

I've seen late runs often occurring due to label mismatch too, but let us know if you are facing a different issue.

Ah, thank you. However, I have not set any labels at all. Should I set a consistent label for the flows and agent?

You can do that, but make sure that labels for agent are superset of labels on the flow. You can see an <https://docs.prefect.io/orchestration/execution/overview.html#labels|example here>.