title: Azure Blob Download Speed
body: <p>I have a 137 GB blob .vhd file in my Azure Storage Container and am attempting to download it using the Azure portal.  Why is the download performance so horrible?  The browser is reporting >12 hours to download.  Why is is so slow?  Can anything be done to get it to download more quickly?</p>
  
  <p><strong>UPDATE</strong>
  Here is the AzCopy usage. I am copying the VM image from one resource group to another.</p>
  
  <pre><code>$srcImageURL = "https://vmimagevhds.blob.core.windows.net/spservers/"
  $srcImageKey = "mykey=="
  
  $destImageURL = "https://vmsdisktorage.blob.core.windows.net/vm-images"
  $destImageKey = "myOtherKey=="
  
  $imageFileName = 'SP2016ServerUnconfigured-osDisk.86ca1057-af4c-4920-9082-6ad155ed2734.vhd'
  
  # Concatenate and AzCopy command
  # Paste into the Azure 
  $azCopyCmd = "AzCopy /Source:" + $srcImageURL + " /Dest:" + $destImageURL + " /SourceKey:" + $srcImageKey + " /DestKey:" + $destImageKey + " /s /pattern:" + $imageFileName
  </code></pre>