Did you know ArcGIS can generate contours instantaneously from your DEM? It's possible if you apply the "contour" raster function! See Help at https://pro.arcgis.com/en/pro-app/latest/help/analysis/raster-functions/contour-function.htm
Be aware that this creates a raster visualization of contours, instantaneous for the current map view - not calculated for the entire dataset. The output layer is a raster, so it still responds to the "IDENTIFY" method - this is used in a dynamic web map or app (not intended solely to be printed), and the raster contours may be more usable, more intuitive than vector contours.
One area where this can be very useful is for really large datasets (e.g. world elevation) --> you don't have to spend hours/days of processing to create vector contour lines and then find out you don't like the settings.
If desired, you can later create cartographic contours as feature lines by running the contour geoprocessing tool on the adaptive-smoothing DEM created by the contour function.
