Loading image first. Not load vector data until user click anywhere on map.
Benefit : user can see whole map information at the first place. Cut the traffic, reduce the arcgis server burden.
Let's look parcel house number example:
https://transparentgov.net:3200/googlemaps111/default?layer_id=2&layer=Parcels_House_Number¢er_lat=33.72098316215652¢er_long=-116.28153569675872¢er_zoom=17&url=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices%2FPublicSafety%2FBaseMap%2FMapServer&panto=0
Parcel APN example:
https://transparentgov.net:3200/googlemaps111/default?layer_id=3&layer=Parcels_APN¢er_lat=33.72007742906516¢er_long=-116.28037698246429¢er_zoom=19&url=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices%2FPublicSafety%2FBaseMap%2FMapServer&panto=0
Check more example:
https://transparentgov.net/json2tree/esri/server/folder.html?url=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices&org=La+Quinta+CA&_center_lat=33.6634&_center_long=-116.31&_center_zoom=17&select_folder=14&select_layer=3
https://transparentgov.net/json2tree/esri/server/restapi.html?url=https://gis.la-quinta.org/arcgis/rest/services&org=La%20Quinta%20CA&_center_lat=33.6634&_center_long=-116.31&_center_zoom=17
Warning:
Feature Server will failed loading image, only Map Server works
following feature server will not work with image priority viewer
Feature Server would not export image, Map Server does.
Let's compare https://transparentgov.net/json2tree/esri/server/folder.html?url=https%3A%2F%2Fgis.cityofredlands.org%2Farcgis%2Frest%2Fservices&org=Redland+CA&_center_lat=40&_center_long=-74&_center_zoom=17&select_folder=204&select_layer=0
https://transparentgov.net/json2tree/esri/server/folder.html?url=https%3A%2F%2Fgis.cityofredlands.org%2Farcgis%2Frest%2Fservices&org=Redland+CA&_center_lat=40&_center_long=-74&_center_zoom=17&select_folder=34&select_layer=0
Map server example:
https://transparentgov.net:3200/googlemaps111/default?layer_id=0&layer=Trees¢er_lat=34.07867235222863¢er_long=-117.17836449579895¢er_zoom=17&url=https%3A%2F%2Fgis.cityofredlands.org%2Farcgis%2Frest%2Fservices%2FTreesOnly%2FMapServer&panto=0
Feature server example:
https://transparentgov.net:3200/googlemaps111/default?layer_id=0&layer=Trees¢er_lat=34.07869012495072¢er_long=-117.18024204210937¢er_zoom=17&url=https%3A%2F%2Fgis.cityofredlands.org%2Farcgis%2Frest%2Fservices%2FTreesOnly%2FFeatureServer&panto=0