# Response Time Histogram

> See response times for selected servers as ten bars, each the percentage of replies in that range.

Source: https://docs.capaone.com/performanceguard/i-want-to-know/i-want-to-know-if-servers-respond-quickly/response-time-histogram/  
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/69e8eef3-61e3-4658-a8fc-8649ede029b9.png) in the example image.

![](/attachments/performanceguard/8fbb5b51-56f9-4db5-a29d-a1d6135604a8.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>
:::

- **Servers**: Select which servers or server groups you want to base your histogram on. Server groups are enclosed in \<\>. You can only select server groups and monitored servers. See [Server Lists](/performanceguard/administration/more-setup/server-lists/) for details about monitored servers.

:::tip
Select multiple servers and server groups by pressing the CTRL key while selecting the servers.
:::

- **Agents**: Select the group of computers you want to base your histogram on. Super groups, that is groups of groups, are enclosed in \<\>.
- **Interval**: Select the period of time that the graph should cover. If the predefined intervals don't suit you, select **Custom** to [Custom Time Periods on Graphs](/performanceguard/analyze/custom-time-periods-on-graphs/).
- **Ports**: Select which port or port group you want to base your histogram on. Port groups are enclosed in \<\>. You can only select port groups and monitored ports. See Port Lists for details about monitored ports.