Planning time is 300ms, but the actual execution time is 300 seconds. Why is there such a difference?

The difference between the planning time (300 ms) and the actual execution time (300 seconds) can be caused by several reasons:

• Planning — this is the time the system spends preparing the task for execution (e.g., compilation, resource allocation, thread scheduling).
• Actual execution — this is the real time the task takes to run.

Possible reasons for a large difference:

1. Locks and waits: the task may be waiting in a queue, waiting for resources or locks.
2. Unforeseen delays: for example, accessing slow external services, networks, disks.
3. Logic errors: infinite loops or inefficient algorithms.
4. Resource shortages: CPU, memory, I/O, which slow down execution.

To diagnose, it is recommended to analyze logs, profile the application, and check the infrastructure.