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Re: Making font-lock handle long lines better

From: joakim
Subject: Re: Making font-lock handle long lines better
Date: Fri, 10 Feb 2017 16:57:43 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

Ryan B <address@hidden> writes:

> hi all! it seems like it's been a known issue for a while that font-lock is 
> slow on very long lines. i've tried lots of optimizations - 
> jit-lock/lazy-lock, font-lock-maximum-decoration, etc. - but even on modern 
> hardware, fontifying still hangs my emacs for 5-10s on
> long lines, e.g. 10k-20k characters, whenever they appear. 
> i'm thinking of adding an opt-in line length limit to font-lock-mode, after 
> which it would stop fontifying, evaluating regexps, etc. within each line. 
> i'd love to hear opinions on whether that makes sense, and whether you might 
> consider accepting it into trunk.

As a user, I would appreciate this feature. I dont know if its feasible
to implement it though.

> thanks in advance!
Joakim Verona

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