Large file transfers slows SMB response time for other users

• TrueNAS-12.0-U5.1
• Intel(R) Xeon(R) CPU E3-1231 v3
• 24GB memory
• Pool-1 12TBx2 mirror
• Pool-2 8TBx6 z2
• Win10 clients

User1 move/copy 500GB of data from Pool-2 to Pool-1, it transfers around 150-200MB/s which is the write performance limit of 12TB drives.

User2 tries accessing SMB network shares on Pool-2, but response times are significantly delayed by 3-5 seconds on each folder traversal. Sometimes windows explorer would unresponsive/hang even longer.

What can be...

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