Hi again. I have read the recent postings about slow SPI performance with the R4 MINIMA. I don't have any way to provide a quantitative evaluation. But I do have a program that writes values to a small OLED display and creates a full-color bar graph for data from an Adafruit I2C 10-channel AS7341 multispectral sensor on an Adafruit 2.2" SPI TFT display. With an UNO R3, data updates including re-drawing the bar graph are essentially instantaneous while with an R4 MINIMA that process takes a little over a second. That may not seem like much in human time, and it doesn't really affect this project as it currently stands, but it does seem to be a real performance problem for this new board. I do wonder what will happen when I add a data logging shield to record these data -- and of course the SD card on that shield is an SPI device that will have to coexist with the TFT display. That code won't even compile on an R3 but it should on an R4 MINIMA (it does on a Mega). Also, R4 MINIMA compile times on my Windows 10 computer for even relatively small sketches is agonizingly slow (a minutes or more).