For Raspberry Pi Pico users looking for a fast ILI9341 display driver, Bodmer’s TFT_eSPI now supports the Pico,
GitHub - Bodmer/TFT_eSPI: Arduino and PlatformIO IDE compatible TFT library optimised for the Raspberry Pi Pico (RP2040), STM32, ESP8266 and ESP32 that supports different driver chips.
TFT_eSPI is a very fast display driver for
ESP32/ESP8266/STM32 and highly recommended. The current Pico support is over SPI but a future release may well use PIO for further optimization.