Problem with oscilloscope project

[Rus1408]

Good afternoon. I'm trying to create an oscilloscope project using your library.

In particular, displaying images from multiple channels simultaneously

Faced a problem, it takes a long time to render the grid by drawing a set of separate lines. As a result, the picture blinks.

Is it possible to arrange double buffering for 800 * 600 (3Bit) resolution?

And is there a way to output the entire buffer array at once, and not in separate commands?

Ideally, I would like to draw the coordinate grid, the oscillograms themselves and the accompanying text in one array, according to the frame principle. Is it possible?