i didn't take measure for:
readrawing whole area vs just scrolling and drawing the rest, which is ideal for plotting software, but:


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[*] simple optimized BitBlt for scrolling will be probably always faster that drawing fragmented old 's' patterned pixels along y axis
[*] BitBlt is probably 2D hardware optimized func - even on most hardware, i don't know if this is true, but probably, i am not sure for SetPixel - although i don't know the workings itself in upp, how this is done. So this "point" may not apply here for optimizations.