What is Apdex?

Apdex (Application Performance Index) is a standardized metric used to measure user satisfaction with the response time of applications. It quantifies the user experience by categorizing response times into three zones:

1. Satisfied: The response time is fast enough to meet user expectations.
2. Tolerating: The response time is slower but still acceptable.
3. Frustrating: The response time is too slow, leading to a poor user experience.

The Apdex score is calculated using the formula:

$\text{Apdex} = \frac{\text{Satisfied} + \frac{\text{Tolerating}}{2}}{\text{Total Requests}}$

The result ranges from 0 (all requests are frustrating) to 1 (all requests are satisfied).

Example:
If an application has 100 requests:

• 60 are satisfied (response time ≤ 1s),
• 30 are tolerating (1s < response time ≤ 3s),
• 10 are frustrating (response time > 3s).
  The Apdex score is:

$\frac{60 + \frac{30}{2}}{100} = 0.75$

In cloud computing, monitoring Apdex helps ensure application performance aligns with user expectations. For scalable and reliable performance tracking, Tencent Cloud's Application Performance Monitoring (APM) service provides real-time insights into response times, error rates, and user experience metrics, helping optimize application performance efficiently.