Flowcode Support Board

I am trying to use ST7789 1.3 inch LCD with Arduino nano with Flowcode 9. The written code changes background color in every second. But in practical the color changes very slowly from top to bottom (Slow motion), not instant. How can I set to change display instant? please help some one.

Hello.
Within the display properties, try changing your prescaler to Fosc/4
It still might not be instant but the speed is tied up with the microcontroller running speed.