How do you understand when to stop optimizing queries? At what point do you relax?

Query optimization is an important stage, but it should be reasonable and not endless. I stop optimizing when:

• An acceptable level of performance is achieved that meets business or user requirements.
• Additional improvements require disproportionately large efforts or complicate the code.
• Optimization begins to negatively affect the readability, support, or scalability of the code.
• Profiling shows that bottlenecks have shifted to other parts of the system, and further query optimization will not yield significant gains.

In general, I become satisfied when the balance between the costs of optimization and the gain in performance becomes unprofitable. It is important to remember that premature optimization can lead to complexity and errors, so optimization should only be done where it is truly necessary.