Your layer uses picture markers in symbol level drawing. Picture markers can contain transparent colors, which can impact drawing performance of basemap layers and map services.
Check the drawing performance for your layer or basemap layer in ArcMap. If you are publishing, check the drawing performance for your service in the Preview window.
- If drawing performance is slow, change the symbology properties of your layer to another type of symbol.
Symbol level drawing allows you to choose the drawing order of individual layers of a given symbol or set of symbols to achieve specific cartographic effects. In general, using transparency would defeat the purpose of using symbol level drawing. If your application warrants the use of transparency in conjunction with symbol level drawing, you can choose to mark this warning as an exception to avoid receiving the warning next time you analyze the map. Basemap layers and map services will use a slower method to perform symbol level drawing in this case.