We have deployed PA VM300 series firewall in Azure US West and Azure US East. When a server from US West tries to copy data of 500 Mb to US East server the maximum transfer rate is between 200 - 500 Kbps. When the same file is copied bypassing the firewall, the file transfer rate is 50~60 Mbps.
Tried configuring MSS settings to the interface & application override but nothing helped.
What is the latency between the two sides? What we've noticed is that when latency reaches 30-40ms, SMB performance is severely impacted due to the chatty nature of SMB. If you've opened a support case then we can work with you to review the details of your setup and run some tests to diagnose this further.
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