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Slow redisplay with long lines

From: Stefan Monnier
Subject: Slow redisplay with long lines
Date: Thu, 15 May 2014 16:38:52 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

> Long lines slow down redisplay because it needs to scan the entire
> line to see how tall it will be on display.

Why should it care about the whole line rather than only the part
of it that's displayed?

        Stefan "who presumes there are several other reasons why long
                lines cause severe performance issues"

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