10040: Layer uses unconverted cartographic representations
Your layer uses cartographic representations for symbology. Representations offer tighter control of symbolization but will decrease performance in many circumstances due to the logic required to maintain such control. For this reason, cartographic representations are recommended only for cached map services.
Solutions
Do one of the following:
Review the draw metrics for this layer. If you are sharing the layer, review the data access metrics for the service. Learn about performance in ArcGIS Pro
If you are able to change your layer, convert the symbology to unique values symbology. See Convert representation symbology to unique values symbology for more information.
Remove the layer from your map if it is not needed.
Additional information
Representations provide advanced capabilities for symbolizing your data, but they are not supported in ArcGIS Pro. Some of these capabilities provide fine-grained control of drawing but can decrease performance.