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From: | Gregory Heytings |
Subject: | bug#56682: Fix the long lines font locking related slowdowns |
Date: | Wed, 03 Aug 2022 08:11:08 +0000 |
Try to open the dictionary.json with Emacs on master a month ago.I believe it can also be done with the current master, just after setting long-line-threshold to the nil value. Right?Indeed. With master from one month ago it's even more crystal-clear that you see the statu quo ante.If I set long-line-threshold to nil, does that also disable the redisplay optimizations related to long lines?Ones that caused scrolling delays even after the buffer has been fully fontified.I mean those that *fixed* the said scrolling delays, of course.
To clarify, you need to (setq long-line-threshold nil syntax-wholeline-max most-positive-fixnum) to "recover" (more or less) how master was behaving a month ago. Otherwise you'll see the effect of syntax-wholeline-max, which can be either positive or negative.
Three recipes (with today's master): emacs -Q M-: (setq long-line-threshold nil syntax-wholeline-max most-positive-fixnum) RET C-x C-f dictionary.json RET y ;; takes 160 seconds C-e ;; takes 200 seconds emacs -Q M-: (setq long-line-threshold nil) RET C-x C-f dictionary.json RET y ;; immediate C-e ;; not finished after 1200 seconds (20 minutes), I killed Emacs emacs -Q C-x C-f dictionary.json RET y ;; immediate C-e ;; immediate
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