Consider the following snippet

context "math()"
snippet "([a-zA-Z])#" "Vectors" riA
\mathbf{`!p snip.rv=match.group(1)`} 

The expected behaviour is that if I write A# I get \mathbf{A} immediately, however, when I type that the cursor goes in front of # and then after a second it goes behind it and the snippet is executed.

Does anybody know how can I fix that?

  • It sounds like this is related to tex (or latex). Anyway, does this behavior still occur with all plugins disabled (if any)?
    – husB
    Mar 30, 2022 at 2:29
  • Hi, do you know how can I temporarily disable the plugins to check? Mar 30, 2022 at 9:56
  • @MathsWizzard depends on how you installed them, probably. vim -u DEFAULTS loads without any plugins; then you can manually load ultisnips with the :runtime commands. This sort of delay is commonly observed when there are mappings or abbreviations that start with the same prefix, so that's another place to investigate.
    – D. Ben Knoble
    Mar 30, 2022 at 14:14
  • @MathsWizzard If you are using a plugin manager (eg. packer/vim-plug/pathogen), just comment out the necessary lines. Alternatively if you are using vim8's package management feature, move the plugins from start/ to opt/
    – husB
    Mar 30, 2022 at 14:15
  • Some plugins can be disabled by setting a variable. For example, vimtex can be disabled with let g:vimtex_enabled = 0. Refer to each plugin's help page
    – husB
    Mar 30, 2022 at 14:16

1 Answer 1


My hunch is that you are using vimtex with Ultisnips. While this answer assumes that the behavior comes from vimtex, I recommended to diagnose what exactly is causing this behavior.

This thread details how to find out the specific plugin, or the line in one's config, that causes such a behavior.

Alternatively, a delay in execution suggests that there is a mapping that interferes with it, as alluded by Ben in the comments. This can be investigated with :verbose imap <char>. (Note that imap <char> will list the mappings starting with <char>, and the use of :verbose will show where the mapping was created.)

Now, assuming the behavior is due to vimtex, :verbose imap # will return

i  #B          *@vimtex#imaps#wrap_math("#B", vimtex#imaps#style_math("mathbb"))
    Last set from ~/.vim/plugged/vimtex/autoload/vimtex/imaps.vim line 119
i  #-          *@vimtex#imaps#wrap_math("#-", vimtex#imaps#style_math("overline"))
    Last set from ~/.vim/plugged/vimtex/autoload/vimtex/imaps.vim line 119
i  #c          *@vimtex#imaps#wrap_math("#c", vimtex#imaps#style_math("mathcal"))
    Last set from ~/.vim/plugged/vimtex/autoload/vimtex/imaps.vim line 119
i  #f          *@vimtex#imaps#wrap_math("#f", vimtex#imaps#style_math("mathfrak"))
    Last set from ~/.vim/plugged/vimtex/autoload/vimtex/imaps.vim line 119
i  #b          *@vimtex#imaps#wrap_math("#b", vimtex#imaps#style_math("mathbf"))
    Last set from ~/.vim/plugged/vimtex/autoload/vimtex/imaps.vim line 119
i  #/          *@vimtex#imaps#wrap_math("#/", vimtex#imaps#style_math("slashed"))
    Last set from ~/.vim/plugged/vimtex/autoload/vimtex/imaps.vim line 119

Hence, after # is pressed in insert mode, vim waits for a set time, as the next key may correspond to one of the maps listed above. (For example, the user may press # followed by b, which results in \mathbf{...}). This is why there is a delay after # is pressed (on its own), before # is actually inserted.

The output from :verbose imap also gives us a big clue how to resolve the issue. Searching within VimTeX's documentation :h vimtex for "imap", we see


Some LaTeX commands are very common, and so it is both natural and convenient to have insert mode mappings/abbreviations for them. VimTeX therefore provides a list of such mappings that are enabled by default, see |g:vimtex_imaps_list|
It is of course possible to customize the list of mappings. First, one may specifically disable the entire imaps feature with |g:vimtex_imaps_enabled| or specific default mappings through |g:vimtex_imaps_disabled|. ...

Thus, we can remove these mappings with

  • either let g:vimtex_imaps_enabled = 0, which disables all imaps set by vimtex,
  • or let g:vimtex_imaps_disabled = ['B','-','c','f','b','/'] which disables only specific imaps.
  • You were exactly right! I am realy impressed with all of your vim/ulti snips knowledge!. I got it to work with the first of your suggestions, however, the second one doesn't seem to work. I added let g:vimtex_imaps_disabled = ['#'] to my .vimrc and it did not change the behaviour. Was I suppose to do that? Apologies for my incompetence with a lot of this... Mar 31, 2022 at 19:59
  • I just realised that I was supposed to copy 'let g:vimtex_imaps_disabled = ['B','-','c','f','b','/']'. Thank you very much! You are amazing! My question has been answered. Mar 31, 2022 at 20:00
  • @MathsWizzard Thank you for the kind words :) Well, many on this site surpass me, and I have benefited from their knowledge. Hopefully the pointers written here will be helpful when you encounter similar problems in future! Cheers!
    – husB
    Apr 1, 2022 at 7:46

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