You need to serve static content from the corporate website.

Store all static content in Azure Blob Storage. Enable Azure Content Delivery Network for the storage account.

Configure App Service networking to create a Content Delivery Network profile and endpoint.

Configure the Azure App Service Local Cache feature and set the app setting WEBSITE_LOCAL_CACHE_SIZEINMB value.

Update the Azure Traffic Manager routing method to priority.

Create a nested Azure Traffic Manager profile. Configure the parent profile to the performance traffic routing method and the chtld profile to the priority traffic routing method.