Slow display flushing #229
Description
I'm using a 128x32 pixel SSD1306 display connected to an ESP32S2 in std environment (rust on top of IDF). The I2C bus is configured with 400kHz. After a display.clear(), only two numbers are drawn using embedded_graphics. Flushing the display afterwards is quite slow and takes more than a second. This is approximately 10x slower than using C++. Is this expected? How can I speed it up or debug it?