When some of us open large Org mode files, Emacs becomes nearly unresponsive, and nearly unusable. My stock advice has always been to call #+STARTUP: showeverything or do a binary search more or less to figure out which package is stomping Emacs. In this post, though, Puneeth explains that the issue may go away entirely for some of us.
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I don’t know when they were incorporated, but these changes have been applied to the latest version of org (20150209) from elpa.
CHRIS MCMAHAN:
Did it work well for you? What was the size for the Org file where you ran into slowdown?