documentclass[a4paper,11pt]{article}

usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}

usepackage{tikz}

usetikzlibrary{patterns}

usepackage{pgfplots}
usetikzlibrary{pgfplots.groupplots}
pgfplotsset{compat=1.16}

begin{document}

begin{figure}[p]
  centering
  begin{tikzpicture}
    begin{groupplot}[
      width=textwidth,
      height=19cm,
      symbolic x coords={brainfuck,queens,sha512,sha512Int},
      xtick=data,
      x tick label style={rotate=45,anchor=east},
      ytick distance=1,
      ymin=0, ymax=50,
      ymajorgrids=true,
      legend style={
        at={(0.5,-1.7cm)},
        anchor=north,
        legend columns=4,
      },
      ybar,
      group style={
        group size=1 by 2,
        xticklabels at=edge bottom,
        vertical sep=0pt,
      },
    ]

    nextgroupplot[
      ymin=61,ymax=90,
      ytick distance=10,
      axis x line*=top,
      axis y discontinuity=parallel,
      height=4.5cm,
      bar width=7pt,
      enlarge x limits=0.15,
    ]
      addplot[fill=lightgray] table [x=Benchmark,y=es5.1 dev no-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[fill=lightgray,postaction={pattern=north east lines}] table [x=Benchmark,y=es5.1 dev yes-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[] table [x=Benchmark,y=es5.1 prod no-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[pattern=north west lines] table [x=Benchmark,y=es5.1 prod no-opt yes-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[pattern=north east lines] table [x=Benchmark,y=es5.1 prod yes-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[pattern=crosshatch] table [x=Benchmark,y=es5.1 prod yes-opt yes-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};

    nextgroupplot[
      ymin=0,ymax=20.5,
      ytick distance=3,
      axis x line*=bottom,
      height=14.5cm,
      bar width=7pt,
      enlarge x limits=0.15,
      ylabel=Normalized running time (lower is better),
    ]
      addlegendimage{fill=lightgray}
      addlegendentry{Dev mode}
      addlegendimage{fill=white}
      addlegendentry{Prod mode}
      addlegendimage{pattern=north east lines}
      addlegendentry{with Scala.js optimizer}
      addlegendimage{pattern=north west lines}
      addlegendentry{with GCC}

      addplot[fill=lightgray] table [x=Benchmark,y=es5.1 dev no-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[fill=lightgray,postaction={pattern=north east lines}] table [x=Benchmark,y=es5.1 dev yes-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[] table [x=Benchmark,y=es5.1 prod no-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[pattern=north west lines] table [x=Benchmark,y=es5.1 prod no-opt yes-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[pattern=north east lines] table [x=Benchmark,y=es5.1 prod yes-opt no-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
      addplot[pattern=crosshatch] table [x=Benchmark,y=es5.1 prod yes-opt yes-gcc Node.js,col sep=comma] {final-performance-results-slow-ones.csv};
    end{groupplot}
  end{tikzpicture}
  caption{The effects of several optimization options on Node.js (part 2: the slow ones)}
  label{fig:opts-options-on-nodejs-slow-ones}
end{figure}

end{document}

Benchmark,es2015 prod yes-opt no-gcc Chrome,es2015 prod yes-opt no-gcc Firefox,es2015 prod yes-opt no-gcc Node.js,es5.1 dev no-opt no-gcc Chrome,es5.1 dev no-opt no-gcc Firefox,es5.1 dev no-opt no-gcc Node.js,es5.1 dev yes-opt no-gcc Chrome,es5.1 dev yes-opt no-gcc Firefox,es5.1 dev yes-opt no-gcc Node.js,es5.1 prod no-opt no-gcc Chrome,es5.1 prod no-opt no-gcc Firefox,es5.1 prod no-opt no-gcc Node.js,es5.1 prod no-opt yes-gcc Chrome,es5.1 prod no-opt yes-gcc Firefox,es5.1 prod no-opt yes-gcc Node.js,es5.1 prod yes-opt no-gcc Chrome,es5.1 prod yes-opt no-gcc Firefox,es5.1 prod yes-opt no-gcc Node.js,es5.1 prod yes-opt yes-gcc Chrome,es5.1 prod yes-opt yes-gcc Firefox,es5.1 prod yes-opt yes-gcc Node.js
brainfuck,3.86,7.69,3.46,9.27,17.79,8.92,6.08,7.08,5.73,6.65,15.21,6.31,6.24,11.17,5.99,3.80,4.93,3.41,3.42,4.22,3.26
queens,14.06,24.95,18.30,13.72,33.58,14.10,3.94,16.42,4.38,12.63,31.42,13.54,11.36,26.33,11.17,3.76,16.87,3.92,3.78,15.39,3.94
sha512,11.08,159.16,10.27,91.23,102.92,87.97,16.59,17.77,15.64,74.94,99.72,69.34,81.23,87.01,75.85,11.29,15.68,10.02,11.06,11.44,10.23
sha512Int,4.83,8.45,4.14,19.98,13.16,18.88,9.36,10.72,8.56,12.15,11.80,11.48,10.47,9.73,10.00,4.54,3.50,4.01,4.59,3.30,4.04