# Case Study Background (B)

+ Starting at 10:00am, the cluster write is slow, TiKV CPU is relatively high, and the current latency is high, reaching the level of minutes, and the duration of the problem period is usually 99 lines around 4s.
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Starting at 10:00am, cluster writes are slow, TiKV CPU is high, and the current delay (duration) is high, up to the minute (min) level. The general duration of the problem period is about 4s.