That 36 MB/s has to be sustained from PSRAM to the LCD DMA, while the CPU (and LovyanGFX, used for graphics) are also writing ...
TinyML is an incredibly powerful piece of software, and you can easily train your own model and deploy it on an ESP32.
To erase the Flash Memory on an ESP32 using a CMD or Terminal window, your system should have the latest version of Python. If Python is not installed on your system ...