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And here's a Reddit comment explaining PSRAM under Arduino:
"Yes, PSRAM is supported including in ESP32 Arduino Core v1.0.1 provided you choose a Board which has attached PSRAM in the Tools menu.
Replace any malloc() call with ps_malloc() and it will allocate the buffer from PSRAM instead of internal memory. That's the only thing you need to do.
If you want to go one layer deeper then ESP-IDF has a "heap capabilities" layer which lets you do other fancy things, but for most use cases ps_malloc() will work fine."
I notice that you have to select a checkbox under Tools in the current version of the Arduino IDE to enable PSRAM. I haven't actually tried using it yet, I'm still playing with MicroPython now that I've finally got enough memory to support it and have more than 64k left to play with.
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