Your bug report

#78766: 100-4000x redisplay slowdown with vscroll>0 and make-cursor-line-fully-visible=t

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 78766@debbugs.gnu.org.

-- 
78766: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=78766
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