The second chart in the bottom section, shows the load on the PostgreSQL database system, in terms of maximum amount of time taken by each query in a database.
Each bar represents the maximum time taken by a query among all of its executions.
The load is measured in terms of units of time taken by a query to execute.
The X-axis represents the query identifier and the Y-axis represents the time taken to execute.
Hover over the bar for more information.
Longer the peak of the bar, higher the time taken. If you feel like the query shouldn't be taking that long, it is most likely causing a high load on the system.
Identify the query and fine tune it to reduce the time taken to execute.