http://bugs.winehq.org/show_bug.cgi?id=30593
--- Comment #4 from Dan Kegel dank@kegel.com 2012-05-05 19:22:35 CDT --- Looking around for a workaround that app vendors could use, I hit on the idea of using WM_SETREDRAW to disable redraws during big richedit changes. With native riched20, this can speed things up quite a bit. Builtin riched20 doesn't seem to support it yet (it hangs). I should file a separate bug for that.