Rendering map views is computationally more intensive than rendering tabular views.
Map rendering entails the following, which explains why it requires greater computational resources:
Query spatial data.
Create the polygons and shapes that correspond to geographical entities such as countries and states.
Place the polygons and shapes on a background map.
Provide end-user interactivity such as the ability to pan and zoom, to adjust color thresholds, and to show or hide formats.
Assess the extent of expected usage of map views at your organization including the number of users that are expected to use map views, the amount of data to be displayed on map views, and the amount of spatial data that is expected to be displayed (such as only city boundaries or street level details). Based on this assessment, decide on an appropriate hardware sizing and deployment strategy. Also review the available documentation on best practices for achieving optimal performance and scalability with your Oracle MapViewer deployment.