Using the cocoa (NS) version of emacs 23.0.9.1, enabling both word-wrap and flyspell modes makes scrolling up and down through text slow and jerky.  Turning off flyspell mode seems to eliminate the problem entirely.  Turning off word-wrap (while leaving flyspell active) appears to reduce it significantly.   The problem seems to occur regardless of the major mode (I have tried it with text, org, and latex modes).<br>
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