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Function app seems to reinitialize very often, causing latency

David -Castlab 0 Reputation points
2026-01-14T16:08:23.2633333+00:00

Attached you see the logs, where in a short amount of time multiple initializations happen. This happens constantly making the app hard/slow to use.

Initializing function HTTP routes
Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

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  1. Siddhesh Desai 7,480 Reputation points Microsoft External Staff Moderator
    2026-01-14T17:14:56.4366667+00:00

    Hi @David -Castlab

    Thank you for reaching out to Microsoft Q&A.

    I checked on the backend. This is one issue it is showing with your function.json not being parsed correctly. Are you using python v2 programming model and an http trigger?

    Scenario: Could not parse function.json

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  2. AI answer

    2026-01-14T16:08:35.17+00:00

    If your Azure Function app is reinitializing frequently, leading to latency issues, it could be due to several factors. Here are some common causes and troubleshooting steps you can consider:

    1. Cold Starts: If your function app is running in a consumption plan, it may experience cold starts, especially if it hasn't been invoked for a while. This can lead to delays in response time.
    2. Memory and CPU Usage: High memory or CPU usage can cause the function app to restart. Monitor your app's resource usage to ensure it's within acceptable limits.
    3. Application Insights: Ensure that Application Insights is configured correctly to monitor your app's performance. This can help identify any bottlenecks or issues causing the reinitializations.
    4. Configuration Issues: Check your configuration settings in the Azure portal. Ensure that your app settings are correctly configured and that there are no conflicting settings that might cause reinitialization.
    5. Function Code: Review your function code for any inefficiencies or long-running processes that could cause the function to take longer to initialize.
    6. Logs: Utilize the logs available in the Azure portal to identify any specific errors or warnings that occur during initialization. This can provide insights into what might be causing the frequent reinitializations.

    If the problem persists, consider reaching out to Azure support for further assistance.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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