I am working with a web map that has a large number of custom symbols. We are deploying this map to our organization's ArcGIS Server. When deployed the load time for the map is extremely slow. I think this is related to the custom symbols. I was originally using a SVG file for the symbols but after testing the map I found the PNG symbols load faster but when compared to the symbols that ArcGIS Pro provides they are still really slow.
Does anyone have documentation explaining how to properly set up SVG or PNG custom symbols for use on web maps or is there any discussions somewhere that can provide me some tips on optimizing performance for symbols used in web maps?
Any direction or help would be much appreciated.