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Low redisplay performance (23 regression)

From: David Reitter
Subject: Low redisplay performance (23 regression)
Date: Mon, 20 Apr 2009 17:58:53 -0400

I've been noticing a substantial slowdown in redisplay performance. Scrolling down emacs.c in fundamental-mode takes about 2 seconds in Emacs 22 (Carbon port), and 3 seconds in Emacs 23 (NS port).

With font-lock-mode (in c-mode) enabled, the difference is even larger:

About 2.5 seconds in Emacs 22, and more than 7 seconds in 23/NS.

The effect interacts with the display of overlays etc. in the header line. When turning that off, I get about 2.5 seconds in Emacs 22, and still more than 4 seconds in 23/NS. (All values estimated manually from several tries.)

I'm wondering if others get the same on other platforms comparing 22 and 23, or if this is a problem specifically in the NS port (for example, with setting drawing color or the like).

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