blocks|key|256517|text|为了帮助处理大文件，我安装了自己的find-file-hook，它打开基本模式(避免字体锁定)，关闭撤消，并将缓冲区设为只读，以避免任何意外更改(对大文件进行不必要的备份)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|256518|(defun+my-find-file-check-make-large-file-read-only-hook+()
++"If+a+file+is+over+a+given+size,+make+the+buffer+read+only."
++(when+(>+(buffer-size)+(*+1024+1024))
++++(setq+buffer-read-only+t)
++++(buffer-disable-undo)
++++(fundamental-mode)))

(add-hook+'find-file-hook+'my-find-file-check-make-large-file-read-only-hook)|code-block|syntax|javascript|256519|显然，可以根据您认为合适的方式调整阈值。|256520|entityMap^0|H|E|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

To help with large files, I've installed my own <code>find-file-hook</code> which turns on fundamental mode (avoids font-lock), turns off undo, and makes the buffer read-only just to avoid any accidental changes (making unnecessary backups of large files).

<pre><code>(defun my-find-file-check-make-large-file-read-only-hook ()
 "If a file is over a given size, make the buffer read only."
 (when (&gt; (buffer-size) (* 1024 1024))
 (setq buffer-read-only t)
 (buffer-disable-undo)
 (fundamental-mode)))

(add-hook 'find-file-hook 'my-find-file-check-make-large-file-read-only-hook)
</code></pre>

Obviously adjust the threshold value as you see fit.

blocks|key|39777|text|我通常展开较长的行，并按标签(如HTML、XML、JSON)进行缩进。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|39778|为了使这种操作成为可能，我补充说：|39779|(setq+line-number-display-limit+large-file-warning-threshold)
(setq+line-number-display-limit-width+200)

(defun+my--is-file-large+()
++"If+buffer+too+large+and+my+cause+performance+issue."
++(<+large-file-warning-threshold+(buffer-size)))

(define-derived-mode+my-large-file-mode+fundamental-mode+"LargeFile"
++"Fixes+performance+issues+in+Emacs+for+large+files."
++;;+(setq+buffer-read-only+t)
++(setq+bidi-display-reordering+nil)
++(jit-lock-mode+nil)
++(buffer-disable-undo)
++(set+(make-variable-buffer-local+'global-hl-line-mode)+nil)
++(set+(make-variable-buffer-local+'line-number-mode)+nil)
++(set+(make-variable-buffer-local+'column-number-mode)+nil)+)

(add-to-list+'magic-mode-alist+(cons+#'my--is-file-large+#'my-large-file-mode))|code-block|syntax|javascript|39780|请注意，我不使用find-file-hooks，因为magic-mode-alist通常为空，并且具有优先级。如果我添加find-file-hooks，它首先通过nxml-mode验证XML文件，然后切换到fundamental-mode。|offset|length|style|CODE|39781|我按正则表达式拆分行，对于XML：C-M-%25+><+RET+>NL<+RET+!。|39782|在Emacs拆分长行之后-可以启用许多*-modes并重新缩进代码。|39783|entityMap^0|0|0|0|8|F|Q|G|1O|F|29|9|2V|G|0|H|N|0|J|7|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]|$K|10|L|11|M|N]|$K|12|L|13|M|N]|$K|14|L|15|M|N]|$K|16|L|17|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|18|8|@$K|19|L|1A|M|N]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1B|8|@$K|1C|L|1D|M|N]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|T|$]]

I usually unroll long lines and indent by tags (like HTML, XML, JSON).

In order to make such operation possible I add:

<pre><code>(setq line-number-display-limit large-file-warning-threshold)
(setq line-number-display-limit-width 200)

(defun my--is-file-large ()
 "If buffer too large and my cause performance issue."
 (&lt; large-file-warning-threshold (buffer-size)))

(define-derived-mode my-large-file-mode fundamental-mode "LargeFile"
 "Fixes performance issues in Emacs for large files."
 ;; (setq buffer-read-only t)
 (setq bidi-display-reordering nil)
 (jit-lock-mode nil)
 (buffer-disable-undo)
 (set (make-variable-buffer-local 'global-hl-line-mode) nil)
 (set (make-variable-buffer-local 'line-number-mode) nil)
 (set (make-variable-buffer-local 'column-number-mode) nil) )

(add-to-list 'magic-mode-alist (cons #'my--is-file-large #'my-large-file-mode))
</code></pre>

Note that I don't use <code>find-file-hooks</code> as <code>magic-mode-alist</code> usually empty and have priority. If I add <code>find-file-hooks</code> it first validate XML file by <code>nxml-mode</code> and then switch to <code>fundamental-mode</code>.

I split line by regex, for XML it: <code>C-M-% &gt;&lt; RET &gt;NL&lt; RET !</code>.

After Emacs split long lines - it is possible to enable many <code>*-modes</code> and re-indent code.

blocks|key|39796|text|这可能是一种技巧解决方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|39797|M-x壳层|39798|然后|39799|减少your_large_file.txt|39800|你就可以继续了|39801|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

it may be trick workaround 
M-x shell 
then 
less your_large_file.txt 
and you can proceed

Emacs sometimes hangs when viewing large file. But it is fast with <code>(global-font-lock-mode -1)</code>.

I'm using a fork of Prelude.

Emacs version: 24.3 cocoa
System: OS X 10.8.4

Update: I found <code>(setq jit-lock-defer-time 0.05)</code> is a method to improve the scrolling speed.

How to improve emacs performance when view large file?

JSON

查看大文件时，Emacs有时会挂起。但是使用(global-font-lock-mode -1)是很快的。我用的是前奏的叉子。Emacs版本: 24.3可可系统: OS X 10.8.4更新:我发现(setq jit-lock-defer-time 0.05)是一种提高滚动速度的方法。

问如何提高emacs在查看大文件时的性能？
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