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