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-   -   Emacs 24.1 performance regression. (

Jefferson 07-22-2012 02:23 PM

Emacs 24.1 performance regression.
Hi! I've run an emacs test (kind of), using, for example, file /usr/src/linux/crypto/testmgr.h (actually problem reproducible on other "large files" (several K of lines).

Steps to reproduce:
1. open file
2. push C-v (or PgDn) and do not release it till EOF reached
3. stuttering occurs (screen stops refreshing).

Actually in previous versions of Emacs i never seen such behaviour (in 23.1 i'm 100% confident).
If i open same file in vim, for example, it scrolls till EOF smoothly, never stutters.
Somebody, close to emacs development, has to check this out. I just tried it on latest 24.1.50 - problem persists, and -Q option gives same result.

Jefferson 07-26-2012 01:52 PM

Oh, nevermind. I've figured how to tweak it.

M-x customize-option
Customize variable: jit-lock-chunk-size

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