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what are the specs form this display? the title says 240x240, but what size? How many colors and refresh rate?

Driver: ST7789 Interface: SPI Display color: RGB, 65K color Resolution: 240x240 Backlight: LED Operating voltage: 3.3V

It looks like I2C, so it's probably damn slow.

They're SPI driven and store their own pixels. You don't need to clock it like a parallel display.