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From: Stefan Monnier <monnier@iro.umontreal.ca>
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Subject: Re: Defer jit-lock on a per-buffer basis
Date: Thu, 15 Nov 2012 15:38:27 -0500
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> suggested to set `jit-lock-defer-time' to some small fraction to defer
> jit-lock fontification a bit.  This has an enormous effect for example
> when scrolling in large c-mode buffers.

FWIW, you can argue that it's a bug in the c-mode.


        Stefan