Hi Kristine,
What kind of device are the users in the field using to access the Storymap?
Map rendering for web maps depends heavily on the data in the map. Are your maps slow if you view them in the ArcGIS map viewer (outside of a story map)? Can you try accessing your stories from another network, like your home network, to see if there is any difference in performance? Are any of your stories or web maps public and if so can you share the links here so we can take a look?
