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bug#14259: 24.1; global-linum-mode slows down scrolling and user input i
bug#14259: 24.1; global-linum-mode slows down scrolling and user input in DocView
Wed, 24 Apr 2013 14:47:02 -0400
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)
> 2. Open a PDF that has pages you can scroll
> 5. Ensure the global-linum-mode is enabled and now scroll around/change
> pages/etc. There should be a noticeable lag that makes it very hard to use
Indeed, I can reproduce it, and it's not just a "noticeable lag" for me,
it's so dog slow that it makes you feel like Emacs is failing to respond.
> Does it help to use nlinum from GNU ELPA instead?
Yes, it's much faster. With nlinum-mode, there is still a slowdown
(slightly more noticeable for horizontal scrolls than vertical scrolls),
but it's much less severe.
You can see the exact same slow down if you just do:
M-: (set-window-margins (selected-window) 2) RET
So the performance cost doesn't come from nlinum-mode.
As for linum-mode, I'm not sure where the performance problem lies.