Add global level or book level text variables.
It would be nice to have book level text variable(s) that is used in documents in that book.
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Richard Tyson commented
InDesign's Display Performance should be set to Typical. Watching high-resolution images causes InDesign to redraw areas so frequently that it uses up a lot of your processor's resources. https://domyonlineexam.com/
Josh Steves commented
YES! Running header variables dont work in textframes across spreads. This seems like a huge oversight. A global variable would fix this.