sn_atf.custom_ui.wait.dom_mutation_only_interval_ms

ServiceNow property description:

GlideAutomateWait additional interval after everything but DOM mutations have finished. Specifies how many milliseconds to wait after all other activities on the page have finished except for repeating setTimeout() calls that may cause DOM mutations. A value of 0 means that the interval is not used, and values greater than zero specify a wait interval in milliseconds.