Step 1.
google new marker improved performance, but.... continue read click here
https://transparentgov.net/cleargov1/1825/has-google-fix-its-20-years-marker-crash-issue-yet-model-6799
Below use address = POI for testing purpose,
Step 2.
4k POI ( address ) with new google marker, not crash yet, but extremely slow.
model 7456
https://transparentgov.net/json2tree/gateway/google-efficient-engine/entire-new-marker-no-limit.html?layer_id=4&layer=Active+Grantees¢er_lat=42.173021918612065¢er_long=-96.56555886196848¢er_zoom=4&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FGrants%2FGrants%2FMapServer&panto=0

Step 3.
4k POI ( address ) with old google marker, completely crash, freezing , no response.
model 7458
https://transparentgov.net/json2tree/gateway/google-efficient-engine/entire-no-limit.html?layer_id=4&layer=Active+Grantees¢er_lat=42.95064181167623¢er_long=-97.21606837356286¢er_zoom=4&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FGrants%2FGrants%2FMapServer&panto=0

Step 4.
4k POI ( address ) with microsoft marker, no crash, no slow, everything is normal
model 7452
https://transparentgov.net/json2tree/gateway/microsoft/feature-layer-entire.html?layer_id=4&layer=Active+Grantees&_center_lat=38.80623800663372&_center_long=-95.14575040932402&_center_zoom=3.565675930017555&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FGrants%2FGrants%2FMapServer&panto=0

Step 5.
here is those model used for 4k POI
https://transparentgov.net/json2tree/esri/server/folder2.html?org=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&select_folder=85&select_layer=4&arcgis_online_token=&select_folder_text=Grants+%3Csup%3EMapServer%3C%2Fsup%3E&select_layer_text=4+%26%23x21E2%3B+Active+Grantees+%3Csup%3EFeature+Layer%3Csub%3E+esriGeometryPoint%3C%2Fsub%3E%3C%2Fsup%3E

Step 6.
17k POI ( address ) with new google marker, completely crash
model 7456
https://transparentgov.net/json2tree/gateway/google-efficient-engine/entire-new-marker-no-limit.html?layer_id=3&layer=Grantees¢er_lat=43.02675987716269¢er_long=-97.59514736898649¢er_zoom=4&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FGrants%2FGrants%2FMapServer&panto=0

Step 7.
17k POI ( address ) with microsoft marker, no noticable slow down,
model 7452
https://transparentgov.net/json2tree/gateway/microsoft/feature-layer-entire.html?layer_id=3&layer=Grantees&_center_lat=37.642527250089785&_center_long=-94.87155536781358&_center_zoom=3.7873209014756113&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices%2FGrants%2FGrants%2FMapServer&panto=0

Step 8.
here is those model used for 4k POI
https://transparentgov.net/json2tree/esri/server/folder2.html?org=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&url=https%3A%2F%2Fgisportal.hrsa.gov%2Fserver%2Frest%2Fservices&select_folder=85&select_layer=3&arcgis_online_token=&select_folder_text=Grants+%3Csup%3EMapServer%3C%2Fsup%3E&select_layer_text=3+%26%23x21E2%3B+Grantees+%3Csup%3EFeature+Layer%3Csub%3E+esriGeometryPoint%3C%2Fsub%3E%3C%2Fsup%3E
