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NFS performance is slow without any latency increasing in ONTAP
https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/NFS_performance_is_slow_without_any_latency_increasing_in_ONTAP
Applies to ONTAP 9 Issue The IOPS and throughput of NFS suddenly decrease without an increase in latency. Example from ONTAP System Manager GUI:

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