I’ve found related thread that you mentioned: My ILI9341 display working very slow
Should I create the new function to replace LCD_DrawPaint() in double-loop?
Is it necessary to run the loop again even if the function like fillRect() mentioned has x, y, w, h and color?
It has x1 to x2 and y1 to y2, just changes the color.
I still can’t get it,
If there is any document that you can refer to, or if you let us know a little, I’d be grateful 