enable Text Split
Sets whether the reading system should split long text nodes into shorter nodes.
Some publications with very long text nodes take a very long time to reflow. Setting this option to true will significantly reduce the time it takes to reflow such a publication.
The trade-off is that when a text node is split, the text after the split will appear on a new line in the rendered content. The reading system will attempt to split at a sentence divider, to make the split as unnoticeable as possible.