[DTS.Pipeline] Warning: The output column "Column 5" (1038) on output "Flat File Source Output" (2) and component "Flat File Source" (1) is not subsequently used in the Data Flow task. Removing this unused output column can increase Data Flow task performance.
what the heck does this mean?
More or less what it says - you have a column that is not used by downstream component.
So the data flow issues a warning that it might be better to just remove this column to save buffer space. Of course it is just optimization warning and can be ignored, but if you want maximum performance do pay attention to such warnings.
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