[O] Org mode in combination with emacs follow-mode is terrible

[Gerald Wildgruber]

Hi,

I'm using emacs (git checkout v. 27.0.50) and Org mode (git checkout
release_9.1.13-760-g8def68).

My typical setup is to use a maximized or full screen emacs frame split
into five windows positioned vertically one next to the other. All five
windows display one and the same file, that is opened using emacs
follow-mode, so that every window is displaying a portion of the same
file in a continuous manner.

Yet, there seems to be an incompatibility between Org mode and
follow-mode: there is terrible lag with every single key input (on a
very fast quad core machine); every key stroke produces a 100% processor
load. It would seem that this is even worse, when working on portions
towards the end of the file. If I deactivate follow-mode, the problem
disappears.

Anyone got an idea what's going on here and how to debug that?

Thanks

Gerald.

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