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chapter/Debugging-Syntax-Files.md

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+## Debugging syntax files
+
+Syntax files are often the cause for slowdowns due to wrong and/or complex
+regular expressions. If the `+profile` [feature](#what-kind-of-vim-am-i-running)
+is compiled in, Vim provides the super useful `:syntime` command.
+
+```vim
+:syntime on
+" hit <c-l> a few times to redraw the window which causes the syntax rules to get applied again
+:syntime off
+:syntime report
+```
+
+The output contains important metrics. E.g. you can see which regexp takes too
+long and should be optimized or which regexps are used all the time but never
+even match.
+
+See `:h :syntime`.
+