# Summary

+ Analysis conclusion:
  + The latch wait duration is not high
  + High storage async write duration
+ Further confirm the direction:
  + The overall duration of an async write is the sum of the following 5 parts:
    + Went wait duration
    + Append log duration
    + Commit log duration
    + Apply wait duration
    + Apply log duration


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The latch wait duration is not high
Basically slow Storage async write duration
The overall duration of an async write is the sum of the following 5 parts:
- Exceed wait duration
- Append log duration
- Commit log duration
- Apply wait duration
- Apply log duration