I've checked your version and it takes about 0.16s on ESP32.
I agree, ESP32 its not the fastest on earth.
Anyway, this results in a black led-panel for a remarkable time, before new data is available.
To get a better idea what a setPixel driver in C could be, I created a version for testing. All together it is about 25 lines including initialization. Switching to this driver is done by adding panel:true to config of createArrayBuffer.
Wow, now a clear() takes less than 2msec. And I was able to create some kind of simple animation using graphics class.
I wonder, how we could add this to Espruino. It is specific for these kind of boards (P2.5,P3,P4,P5). It is not as specific as Neopixel, where we need implementation for each board. So it would be available for all boards.
My ideas behind using this panels are things like:
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