Hi @krishnarandadath ,
If you're doing inspection then SMB download is slow by design. Check the following article on why SMB is slow and possible workarounds:
https://live.paloaltonetworks.com/t5/community-blogs/why-is-smb-traffic-slow/ba-p/356471
The firewall typically pins the entire SMB session to a single DP (Data Plane) CPU core. That core spikes to 100% capacity trying to do deep packet inspection on every single sequential block of the 250 GB file. As the single CPU core falls behind, the firewall's internal buffers fill up. It starts dropping packets, causing TCP window sizes to collapse. SMB interprets this network congestion by slowing itself down to a crawl to avoid losing data.
As per the blog I shared above try DSRI or app-override (if possible)
Kind regards,
LIVEcommunity team member, CISSP
Cheers,
Kiwi
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