Azure blob storage streaming performance issue

Question

My application till this day was working with local zip files, meaning I was using a direct return new FileStream() in the application and the local zip file that was located on the SDD/Network drive path (zip files can be hundreds of GB).

I configured the application to work with Azure Blob Storage, meaning each FileStream that was returned in now return as the Azure Blob SDK method:

GetBlobStreamAsync(ContainerName, BlobName).ConfigureAwait(false).GetAwaiter().GetResult()
I uploaded some zip files to a container in the blob storage and set the connection string in the application to work with that storage account.

The application was deployed and running on a virtual windows machine located in the same region of the Azure Storage Blob.

Note: This is a private cloud network.

When the app is streaming the zip file on Azure blob storage it seems that the performance has decreased by at least 8-9 times (problematic with hundreds of GB).

Speed comparison is between local C: drive on the same windows virtual machine that the application is running on an Azure Storage account which is located in the same region.

Note: NW Bandwidth - is 50 GB on the VM on azure

Solutions that I tried:

1. Azure blob Premium Performance storage - Didn’t improve performance
2. .Net Core - advantage of performance enhancements (we work with .Net framework so this is irrelevant).
3. Network File System (NFS) 3.0 performance considerations in Azure Blob storage - (Does not work with private cloud).
4. Hot, Cool, and Archive access tiers for blob data - The default is Hot so we already tried this scenario with no improvements.

Solutions I want to try:

1. Azure Files Share Storage as a cache solution
2. .Net Framework configuration - lists several quick configuration settings that you can use to make significant performance improvements

Question:

Does anyone have any suggestions on how can I optimize the streaming in front of the Azure Storage Blob?