# Coprocessor（C）

+ Grafana —> TikV-Details —> Coprocessor Detail —> Handle duration
  + Select and index are time-consuming

![left](./student-guide/diagram/27-Coprocessor-03-01.png)
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- Coprocessor Handle duration
Handle duration: The time for handling this request using the Handler. The Handle procedure contains:
  - The execution of the operator depends on the CPU, and the CPU load can be used to determine whether the bottleneck is in the CPU
  - The lowest operator TableScan/IndexScan needs to use Range-lookup for Snapshot. If the CPU load is not high, but the Handle duration delay is high, follow the Range-lookup slow issue for further troubleshooting
Grafana —> TikV-Details —> Coprocessor Detail —> Handle duration

Select and index are time-consuming