lineGL - support for line chart type

[rehni]

i have chart with many point (50k+). it is very slow with ordinary echarts line type chart. i cannot just use scatterGL as i need to see also lines,
right now i had to use 2 same series, one ordinary line echart with disabled symbols and the same serie drawn as scatterGL

what i would like to see is your support for linechart (lineGL) so i can use just 1 serie with full webGL support