speedup.js

<table className="table">
  {this._getHeadings()}
  <tbody ref="tbody">
      {this.props.data.map((row, i) => {
          return (
              <tr key={'row_' + i}>
                  {this.props.selected_columns.map((column) => {
                      return (
                          <td className="no-wrap" key={row['id'] + '+' + column}>
                              <Field {...row}
                                     field={column}
                                     value={row[this.props.columns[column]]}
                              />
                          </td>
                      );
                  })}
              </tr>);
      })}
  </tbody>