Average response time of dialog service

What causes this issue?

This monitoring tree element (MTE) reports the response time for the
dialog service. This is the service for interactive processing, as
opposed to the background or the update service.
The dialog response time is the processing time in the SAP application
server. It includes all processing time consumed for the processing of
a dialog step (starting with a user action and ending with the system's
response to the action), including database processing time. It does
not include network transmission time or front-end processing time. The
values that you see here are averaged across dialog steps.
You may see small variations in the statistics reported here as compared
to those reported in the analysis method associated with this MTE. This
variation is due to the finer granularity of the statistics in the
analysis method. The averaging of the values in the alert monitor can
result in small differences in values.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

An alert here indicates a performance problem with your system. Your
users are not receiving the prompt response from the system, as
reflected in the thresholds for response time.
High response times are a general symptom of performance problems. There
can be many different causes of the problem; a careful analysis is
therefore required. You should first check that the application server
is not overloaded, as measured for example by CPU performance, system
paging and dialog work process statistics. Another possible bottleneck
is the database; you should check that the database is performing
satisfactorily.
<DS:DE.STA_AVTRES>Background information</>

Error message extract from SAP system. Copyright SAP SE.