Hello, Welcome to Microsoft Q&A, There is no reference in the official documentation to indicate the minimum network speed required for ASA. Network connection is one of the factors that determines how long it takes to create and locate anchors. To use ASA, you should ensure that your device remains connected to the Internet. ASA works with Wi-Fi and mobile broadband connections. For more information about ASA, you can refer to Azure Spatial Anchors documentation - Azure Spatial Anchors | Microsoft Learn.
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