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From: Glenn Morris <gmorris+news@ast.cam.ac.uk>
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Subject: Re: configuration: how to make emacs re-parse code more quickly
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Peter Lee wrote:

> There are 3 different font lock modes: fast, jit, and lazy.  I'm
> guessing you are using lazy.

My money's on jit-lock. :)

Something like

(setq jit-lock-stealth-time 10)

might help. There are other jit-lock params that can be fiddled with
- see docs for jit-lock-mode.