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With this .vimrc:

nnoremap [ :lp^M
nnoremap ] :lne^M
filetype plugin on

vim becomes sluggish when switching between "errors" of location list with square brackets. As opposed to using lprevious/lnext directly. The same goes for mapping brackets to cprevious/cnext.

Everything is okay without enabling filetype plugins (just filetype on). Or if filetype plugin on is executed after vim has started. Or if vim is started as follows: vim -u ~/.vimrc.

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    The ftplugin for your language probably has mapping starting with [ and ] which may explain that sluggishness: if you have something mapped to ]] ("next method" in python files), for example, Vim will wait a bit in order to see if you want ] or ]].
    – romainl
    May 21 '15 at 19:54
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    Indeed, you're right. First, if you post an answer, I'll accept it. Also, can you explain by any chance why everything is fine if filetype plugin on is executed after vim has started?
    – x-yuri
    May 21 '15 at 20:03
1

Thanks to @romainl, it turns out the delay is caused by ftplugin defining mappings starting with [.

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