How did you calculate that p95 decreased by 16%?

To calculate that p95 (95th percentile) has decreased by 16%, I compared the metric values before and after optimization.

For example, if the service response time p95 was 500 ms, and after changes it became 420 ms, the reduction calculation is:

Reduction = ((500 - 420) / 500) * 100% = 16%

Typically, metrics are collected from monitoring systems (such as Prometheus, Grafana) for the same periods before and after implementing changes, then percentiles are calculated and compared. This approach allows an objective assessment of performance improvement.