What-s-the-optimum-way-to-color-the-distance-between-two-indicators

I have two moving averages. I want to draw the band between them Red when the first above the second and Green on the opposite .


I used :
DrawLine(bar, ema1[bar], bar, ema2[bar], ema1[bar] < ema2[bar] ? WLColor.Green : WLColor.Red, 10, LineStyle.Solid, "macd");

but DrawLine seems slow and not the right way.

Any suggestion?