This is a Raspberry Pi Pico with a generic SSD1351 OLED display. I'm using a custom driver I wrote which takes advantage of the Pico's DMA transfers to the SPI. The demo is basically image rendering, font rendering and software scrolling.
Since this video I've made it a little faster by using two buffers, so the Pico is simultaneously doing a DMA transfer of one buffer whilst preparing the next one. This achieves ballpark around 60fps.
Source code to be released soon.