Subject: Re: bug#56682: Fix the long lines font locking related slowdowns

From: Dmitry Gutov <[email-masked]>
Date: Mon, 15 Aug 2022 18:42:08 +0300

On 15.08.2022 17:06, Eli Zaretskii wrote:
>> Date: Sun, 14 Aug 2022 23:46:13 +0300
>> Cc: [email-masked], [email-masked], [email-masked]
>> From: Dmitry Gutov <[email-masked]>
>>
>> I've also run this test on master now, and M-> is not instant there
>> either.
> 
> It's instantaneous here, so I'm not sure why you see something
> different.

No idea. Size of file, or even the contents might the reason.

Here's the profiler output anyway:

         1067  85% - command-execute
         1067  85%  - call-interactively
         1023  82%   - funcall-interactively
         1012  81%    - end-of-buffer
         1008  81%     - recenter
         1008  81%      - jit-lock-function
         1008  81%       - jit-lock-fontify-now
         1008  81%        - jit-lock--run-functions
         1008  81%         - run-hook-wrapped
         1008  81%          - #<compiled -0x149e7c2f08a063c3>
         1008  81%           - font-lock-fontify-region
         1008  81%            - font-lock-default-fontify-region
         1008  81%             - nxml-extend-region
          720  57%              - skip-syntax-forward
          720  57%               - internal--syntax-propertize
          720  57%                - syntax-propertize
          720  57%                 - nxml-syntax-propertize
          720  57%                  - sgml-syntax-propertize
          378  30%                     #<compiled -0x12505696cac83570>
          294  23%                     sgml--syntax-propertize-ppss
          288  23%              - nxml-move-outside-backwards
          288  23%               - nxml-inside-start
          288  23%                  syntax-ppss
           11   0%    + execute-extended-command
           44   3%   + byte-code
          171  13% - ...
          171  13%    Automatic GC
            5   0% + timer-event-handler