difference in render times between GUI and headless


I have a node with 4x 1080Ti, 128GB and a 16 core xeon and 2012 server
When I render the blender files in the GUI (23 min) it takes so much longer then when I render headless (script) (15 s)
is that because of the server OS or can there be another reason for this difference?


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In general, command line rendering is almost always faster than rendering from the Blender interface. That said, a difference of 23 minutes versus 15 seconds does sound pretty suspicious. Are the resulting rendered frames identical with both approaches?