Mac 10.10.5 / last ID 10.0.0.81 v. 2017
Think it is not a hardware malfunction. The document is a threaded galley with 7 chapters. Simply, inserrting or editing text means to wait some seconds (15-20 or more...).
In an illustrated book with dozens of photographs the machine is very solvent. Just in these files with text + editing the problem is visible.
Perhaps converting the document to a book may be a solution but preferred to consult here...
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Make sure Preflight is turned off, and, you would of course get better performance if the document was broken up into chapters and managed as a book file. You could still jump chapter-to-chapter easily without having such a big draw on your system memory.
Also, if you're using a recent CC version, be sure to disable the 2 settings under Type Contextual Controls in Preferences > Advanced Type.
Thanks. It seems book files menu is the path here.
I was looking to stop ID recomposing in this editing process.