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Re: Performance degradation from long lines

From: Alexander Shukaev
Subject: Re: Performance degradation from long lines
Date: Fri, 26 Oct 2018 18:50:06 +0200

On 10/26/18 6:18 PM, Stefan Monnier wrote:
           (let ((inhibit-field-text-motion t))
             (catch 'break
               (while (not (eobp))
                 (when (> (- (line-end-position 1) (point))
                   (throw 'break t))
                 (forward-line 1)))))))))

I think you can speed this up with the code below (I'd expect a speed up
of about a factor 2 since (line-end-position 1) does about the same as
(forward-line 1)):

     (catch 'break
           (unless (eobp)
             (or (> (+ (point) global-longlines-threshold)
                       (progn (forward-line 1) (point)))
                 (throw 'break t)))))

Thanks for the tip!

(defun inhibit-set-auto-mode-line-number-display-limit-function ()
   (and (integerp line-number-display-limit)
        (> (buffer-size) line-number-display-limit)))
(add-hook 'inhibit-set-auto-mode-functions

Hmm... there seems to be a discrepancy between the identifier and the
code: it seems unrelated to line-number(s).  Maybe some left-over from
a previous version of the code?


You are right, sorry about `line-number-display-limit', it should of course be something more reasonable, e.g. (8 * 1024 * 1024) for 8GiG cap.

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