title: echarts webGL acceleration
body: <p>I want to use echarts in one of my projects. When I load around 1.000.000 data points my chart gets very slow. I know that echarts-gl provides webGL support but I couldn´t find any documentation on how to use it for e.g. line charts - 'lineGL' doesn´t work.</p>
  <p>Anyone has a clue on how to use webGL with line charts in apache echarts?</p>