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support/azure/app-service/web-apps-performance-faqs.md

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author: genlin
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ms.author: genli
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ms.service: azure-app-service
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ms.date: 04/10/2025
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ms.date: 04/14/2025
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ms.reviewer: toan, shrahman
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---
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# Application performance FAQs for Web Apps in Azure
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This article has answers to frequently asked questions (FAQs) about application performance issues for the [Web Apps feature of Azure App Service](https://azure.microsoft.com/services/app-service/web/).
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[!INCLUDE [support-disclaimer](../../includes/support-disclaimer]
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[!INCLUDE [support-disclaimer](../../includes/support-disclaimer.md)]
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## Why is my App Service Plan displaying CPU/Memory usage even when all Web Apps are stopped?
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Multiple factors might contribute to slow app performance. For detailed troubleshooting steps, see [Troubleshoot slow web app performance](/azure/app-service/troubleshoot-performance-degradation).
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> [!TIP]
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> Enable the **Always On** setting under *Configuration > General settings* to keep your app warm and prevent cold starts. This helps reduce delay after idle time, especially in Basic and higher plans.
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> [!TIP]
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> Configure a **Health Check** path to monitor app health and automatically replace unresponsive instances. This helps maintain availability and performance.
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> [Learn more](/azure/app-service/monitor-instances-health-check)
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> - Enable the **Always On** setting under **Configuration** > **General settings** to keep your app warm and avoid cold starts. This helps reduce delay after idle time, especially in Basic and higher plans.
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> - Configure a Health check path to monitor app health and automatically replace unresponsive instances. This helps maintain availability and performance. For more information, see [Monitor App Service instances by using Health check](/azure/app-service/monitor-instances-health-check).
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## How do I troubleshoot a high CPU-consumption scenario?
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You can use PowerShell cmdlets to manage and maintain App Service web apps. In our blog post [Automate web apps hosted in Azure App Service by using PowerShell](/archive/blogs/puneetgupta/automating-webapps-hosted-in-azure-app-service-through-powershell-arm-way), we describe how to use Azure Resource Manager-based PowerShell cmdlets to automate common tasks.
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> [!NOTE]
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> For current automation scripts, use the latest **Az.Websites** module. The older `AzureRM` module is deprecated.
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> [Reference: Az.Websites](/powershell/module/az.websites)
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> For current automation scripts, use the latest [Az.Websites](/powershell/module/az.websites) module. The older `AzureRM` module is deprecated.
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## How do I view my web app's event logs?
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## Additional recommendations for performance and resiliency
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> Use **Application Insights** and **Azure Monitor** for full-stack observability of your App Service app, including telemetry, dependency tracing, and live metrics.
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- Use Application Insights and Azure Monitor for full-stack observability of your App Service app, including telemetry, dependency tracing, and live metrics.
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> [!TIP]
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> If you are deploying in regions that support **Availability Zones**, consider enabling zone redundancy for added resiliency during regional outages.
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> [Learn more](/azure/reliability/reliability-app-service)
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> [!TIP]
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> App Service undergoes **routine maintenance** for platform reliability. For more control over update behavior, especially in App Service Environment v3, configure **Upgrade Preference** settings.
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> [Learn more](/azure/app-service/routine-maintenance)
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- If you're deploying in regions that support availability zones, consider enabling zone redundancy to enhance resiliency during regional outages. For more information, see [Reliability in Azure App Service](/azure/reliability/reliability-app-service).
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- App Service undergoes routine maintenance to ensure platform reliability. For more control over update behavior, especially in App Service Environment v3, configure upgrade preference. For more information, see [Routine (planned) maintenance for Azure App Service](/azure/app-service/routine-maintenance).
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[!INCLUDE [Azure Help Support](../../includes/azure-help-support.md)]

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