As an extra observation, the Load text-based files node will parallelise across multiple CPU cores, and if needed will run in streaming mode. (Incidentally, that info is not visible in the KNIME hub page for the node, as far as I could see, but is visible at https://nodepit.com/node/com.vernalis.nodes.io.txt.LoadTxtNodeFactory - maybe that’s another hub feature to add?)
Version 1.20.5 of the Vernalis nodes has now been release on trunk and stable build channels, and fixes this issue when ‘Guess’ is selected.
Steve