# I Want to Know if Servers Respond Quickly

> Use the Response Time Histogram to see how server response times are distributed and spot potentially overloaded servers.

Source: https://docs.capaone.com/performanceguard/i-want-to-know/i-want-to-know-if-servers-respond-quickly/  
Product: PerformanceGuard — a separate CapaSystems product; do not apply this page to any other.

The Response Time Histogram displays response times for selected servers.

To view the histogram, select **ANALYZE > Graphs > Statistics > Histogram**.

The histogram consists of 10 individual bars.

Each bar represents the percentage of replies within a given milliseconds interval.

This way you can very quickly find out if a particular server is potentially overloaded—like the blue one ![](/attachments/performanceguard/a458a9e2-13cf-4404-a97f-9af38712eef0.png) in the example image.

![](/attachments/performanceguard/7c563ce7-0a7f-4610-9347-862c4d6f8d40.png)
:::tip
In the example, we use the histogram to spot a potentially overloaded server. However, the main benefit of the histogram is that it helps you verify if a high average response time is caused by a major or a minor ratio of the total requests. This in turn can help you determine whether a high average response time is really a problem.
:::

:::note[Important]
<details>
<summary>How can a high average response time not be a problem?</summary>

If a high average response time is caused by a few responses in the 2000-500000 milliseconds interval while the majority of responses are in the 0-10 milliseconds interval, the high average may not be a problem. This of course also depends on your type of organization, which types of applications and servers you run, how business-critical your applications are, etc.

</details>
:::