[Docs] Speeding up a chart

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingGrid: Blank Grid</title>
  <script nonce="undefined" src="https://cdn.zingchart.com/zingchart.min.js"></script>
  <!-- can also render the modules ahead of time here -->
  <!-- <script nonce="undefined" src="https://cdn.zingchart.com/modules/zingchart-zoom-buttons.min.js"></script> -->
  <style>
    html,
    body {
      height: 100%;
      width: 100%;
      margin: 0;
      padding: 0;
    }

    #myChart {
      height: 100%;
      width: 100%;
      min-height: 150px;
    }

    .zc-ref {
      display: none;
    }
  </style>
</head>

<body>
  <!-- CHART CONTAINER -->
  <div id="myChart">
    <a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a>
  </div>

  <script>
    ZC.LICENSE = ["569d52cefae586f634c54f86dc99e6a9", "b55b025e438fa8a98e32482b5f768ff5"]; // window:load event for Javascript to run after HTML
    // because this Javascript is injected into the document head
    window.addEventListener('load', () => {
      // Javascript code to execute after DOM content

      // full ZingChart schema can be found here:
      // https://www.zingchart.com/docs/api/json-configuration/
      let myConfig = {
        globals: {
          fontFamily: 'Lucida Sans Unicode'
        },
        type: 'area',
        plot: {
          mode: 'fast',
          exact: true,
          smartSampling: true,
          hintTs: true,
          maxNodes: 150,
          maxTrackers: 150,
        },
        plotarea: {
          margin: '50 40 40 80'
        },
        preview: {
          borderWidth: 1,
          handle: {
            lineWidth: 0,
            height: 20
          },
          adjustLayout: true
        },
        crosshairX: {},
        scrollX: {},
        scaleX: {
          transform: {
            type: 'date'
          },
          item: {
            fontSize: 10
          },
          zooming: true
        },
        scaleY: {
          autoFit: true,
          minValue: 'auto',
          short: true,
          label: {
            text: 'VOLUMES'
          },
          item: {
            fontSize: 10
          },
          guide: {
            lineStyle: 'solid'
          }
        },
        noData: {
          text: 'No data found',
          backgroundColor: '#efefef'
        },
        // if fetching data remotely define an empty series
        series: [{
          values: []
        }]
      };

      // defined ABOVE the render and sets flags 
      // globally for ALL charts on a page
      zingchart.DEV.CACHECANVASTEXT = true;
      zingchart.DEV.CHECKDECIMALS = false;
      zingchart.DEV.CACHESELECTION = true;
      zingchart.DEV.MEDIARULES = false;
      // zingchart.DEV.SKIPTRACKERS = true;


      // ONLY ONCE we have loaded the zoom-button module
      zingchart.loadModules('zoom-buttons', () => {

        // render the chart right away
        zingchart.render({
          id: 'myChart',
          data: myConfig,
          height: '100%',
          width: '100%',
          output: 'canvas',
          modules: 'zoom-buttons',
        });

        // fetch the data remotely
        fetch('https://cdn.zingchart.com/datasets/timeseries-sample-data.json')
          .then(res => res.json())
          .then(timeseriesData => {
            // assign data to chart
            zingchart.exec('myChart', 'setseriesvalues', {
              plotindex: 0,
              values: timeseriesData.values
            });
          })
          .catch(e => {
            // if error, render blank chart
            console.error('--- error fetching data from: https://cdn.zingchart.com/datasets/timeseries-sample-data.json ---');
            myConfig.title = {};
            myConfig.title.text = 'Error Fetching https://cdn.zingchart.com/datasets/timeseries-sample-data.json';
            // just exec setdata api method since we don't need to render the zoom modules
            // https://www.zingchart.com/docs/api/methods/
            zingchart.exec('myChart', 'setdata', {
              data: myConfig
            });
          });
      });
    });
  </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingGrid: Blank Grid</title>
  <script src="https://cdn.zingchart.com/zingchart.min.js"></script>
  <!-- can also render the modules ahead of time here -->
  <!-- <script src="https://cdn.zingchart.com/modules/zingchart-zoom-buttons.min.js"></script> -->
</head>

<body>
  <!-- CHART CONTAINER -->
  <div id="myChart">
    <a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a>
  </div>

</body>

</html>

html,
body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

#myChart {
  height: 100%;
  width: 100%;
  min-height: 150px;
}

.zc-ref {
  display: none;
}

// window:load event for Javascript to run after HTML
// because this Javascript is injected into the document head
window.addEventListener('load', () => {
  // Javascript code to execute after DOM content

  // full ZingChart schema can be found here:
  // https://www.zingchart.com/docs/api/json-configuration/
  let myConfig = {
    globals: {
      fontFamily: 'Lucida Sans Unicode'
    },
    type: 'area',
    plot: {
      mode: 'fast',
      exact: true,
      smartSampling: true,
      hintTs: true,
      maxNodes: 150,
      maxTrackers: 150,
    },
    plotarea: {
      margin: '50 40 40 80'
    },
    preview: {
      borderWidth: 1,
      handle: {
        lineWidth: 0,
        height: 20
      },
      adjustLayout: true
    },
    crosshairX: {},
    scrollX: {},
    scaleX: {
      transform: {
        type: 'date'
      },
      item: {
        fontSize: 10
      },
      zooming: true
    },
    scaleY: {
      autoFit: true,
      minValue: 'auto',
      short: true,
      label: {
        text: 'VOLUMES'
      },
      item: {
        fontSize: 10
      },
      guide: {
        lineStyle: 'solid'
      }
    },
    noData: {
      text: 'No data found',
      backgroundColor: '#efefef'
    },
    // if fetching data remotely define an empty series
    series: [{
      values: []
    }]
  };

  // defined ABOVE the render and sets flags 
  // globally for ALL charts on a page
  zingchart.DEV.CACHECANVASTEXT = true;
  zingchart.DEV.CHECKDECIMALS = false;
  zingchart.DEV.CACHESELECTION = true;
  zingchart.DEV.MEDIARULES = false;
  // zingchart.DEV.SKIPTRACKERS = true;


  // ONLY ONCE we have loaded the zoom-button module
  zingchart.loadModules('zoom-buttons', () => {

    // render the chart right away
    zingchart.render({
      id: 'myChart',
      data: myConfig,
      height: '100%',
      width: '100%',
      output: 'canvas',
      modules: 'zoom-buttons',
    });

    // fetch the data remotely
    fetch('https://cdn.zingchart.com/datasets/timeseries-sample-data.json')
      .then(res => res.json())
      .then(timeseriesData => {
        // assign data to chart
        zingchart.exec('myChart', 'setseriesvalues', {
          plotindex: 0,
          values: timeseriesData.values
        });
      })
      .catch(e => {
        // if error, render blank chart
        console.error('--- error fetching data from: https://cdn.zingchart.com/datasets/timeseries-sample-data.json ---');
        myConfig.title = {};
        myConfig.title.text = 'Error Fetching https://cdn.zingchart.com/datasets/timeseries-sample-data.json';
        // just exec setdata api method since we don't need to render the zoom modules
        // https://www.zingchart.com/docs/api/methods/
        zingchart.exec('myChart', 'setdata', {
          data: myConfig
        });
      });
  });
});