From: Vincent Belaïche Date: Wed, 25 May 2016 21:42:54 +0000 (+0200) Subject: Document problem: slow screen refresh on missing font. X-Git-Tag: emacs-25.0.95~42 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=0be6725;p=emacs.git Document problem: slow screen refresh on missing font. See discussion of bug#22519 for more on this. --- diff --git a/etc/PROBLEMS b/etc/PROBLEMS index 31f38e3980d..84d39a490a8 100644 --- a/etc/PROBLEMS +++ b/etc/PROBLEMS @@ -749,6 +749,20 @@ the following variables: tex-font-script-display (how much to lower/raise); tex-suscript-height-ratio (how much smaller than normal); tex-suscript-height-minimum (minimum height). +** Screen refresh is slow when there are special characters for which no suitable font is available + +If the display is too slow in refreshing when you scroll to a new +region, or when you edit the buffer, it might be due to the fact that +some characters cannot be displayed in the default font, and Emacs is +spending too much time in looking for a suitable font to display them. + +You can suspect this if you have several characters that are displayed +as small rectangles containing a hexadecimal code inside. + +The solution is to install the appropriate fonts on your machine. For +instance if you are editing a text with a lot of math symbols, then +installing a font like 'Symbola' should solve this problem. + * Internationalization problems ** M-{ does not work on a Spanish PC keyboard.