# Write Duration
+ Where is the slow writes?
  + **`Scheduler latch wait duration:`** The waiting time caused by latch when executing the commit command. It should be less than 1 second.
  + **`Propose wait duration per server:`** The histogram of waiting time of each proposal per `TiKV` instance
  + **`Storage async write duration:`** The time consumed by processing asynchronous write requests. It should be less than 1 second in `P99`

![`smart`](WriteDurationPanel_aa_001_20221028.png)

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