Are DESelect Segment Selections running faster / slower than Query Activities in Automation Studio?

all query activities from deselect segment are running inside salesforce marketing cloud via api a query activity created and started within deselect segment will take the same amount of time to run as the same query created and started in automation studio in case you find that deselect segment selections are taking a longer time to complete than a corresponding query activity in automation studio/journey builder, here are a few points to look at in case you make changes that you want to include, always run your deselect segment selection before using the corresponding query activity from automation studio check for prio deduplication on your deselect segment selection if this feature has been applied, 2 query activities will be generated the first query activity will correspond to the normal selection and the second query activity is where the prio deduplication applies make sure to include both query activities make sure you are using the correct query activity