I broke up with neovim....vim is my best friend now

dot_vim/plugged/vimtex/test/test-completion-bibtex-speed/Makefile

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+.PHONY: test
+
+MYVIM ?= nvim --clean --headless
+
+test:
+	@INMAKE=1                      $(MYVIM) -u bibspeed.vim
+	@INMAKE=1 BACKEND=vim          $(MYVIM) -u bibspeed.vim
+	@#INMAKE=1 BACKEND=bibparse     $(MYVIM) -u bibspeed.vim
+	@#INMAKE=1 BACKEND=bibtexparser $(MYVIM) -u bibspeed.vim
+	@rm -f nvim_servernames.log

dot_vim/plugged/vimtex/test/test-completion-bibtex-speed/bibspeed.tex

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+\documentclass{article}
+% \usepackage[square,sort,comma,numbers]{natbib}
+
+\usepackage{biblatex}
+\addbibresource{../common/huge.bib}
+\addbibresource{../common/local1.bib}
+\addbibresource{../common/local2.bib}
+\addbibresource{biblatex-examples.bib}
+
+\begin{document}
+
+Hello World!~\cite{AndersonHowCanHuman2009}
+
+% \bibliographystyle{elsarticle-num}
+% \bibliography{../common/huge.bib,../common/local1.bib,../common/local2.bib,biblatex-examples.bib}
+\printbibliography
+
+\end{document}

dot_vim/plugged/vimtex/test/test-completion-bibtex-speed/bibspeed.vim

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+set nocompatible
+let &rtp = '../..,' . &rtp
+filetype plugin on
+
+nnoremap q :qall!<cr>
+
+let g:vimtex_cache_root = '.'
+let g:vimtex_cache_persistent = 0
+
+if !empty($BACKEND)
+  let g:vimtex_parser_bib_backend = $BACKEND
+endif
+
+silent edit bibspeed.tex
+
+if empty($INMAKE) | finish | endif
+
+normal! 10G
+
+" execute 'profile start' 'bibspeed-' . g:vimtex_parser_bib_backend . '.log'
+" profile func *
+
+let s:time = vimtex#profile#time()
+silent call vimtex#test#completion('\cite{', '')
+echo 'Backend:' toupper(g:vimtex_parser_bib_backend)
+let s:time = vimtex#profile#time(s:time, 'Time elapsed (1st run)')
+
+" profile pause
+
+call vimtex#test#completion('\cite{', '')
+let s:time = vimtex#profile#time(s:time, 'Time elapsed (2nd run)')
+
+let s:candidates = vimtex#test#completion('\cite{', '')
+let s:time = vimtex#profile#time(s:time, 'Time elapsed (3rd run)')
+echo 'Number of candidates:' len(s:candidates)
+echo "\n"
+
+quit!