Use PSRAM on ESP32 if available

[AcuarioCat]

Is it possible to change the malloc calls to use PSRAM on versions of the ESP32 where PSRAM is available?

[mathieucarbou]

Note sure.
AsyncTCP, like asyncudp in Arduino Core are system libraries that need to execute fast.
Will let @me-no-dev answer.

[me-no-dev]

Malloc does use PSRAM is you are using Arduino 3.x and you allocate over a minimum of 4K (AFAIR). You can use ps_malloc to force allocation to PSRAM for any size.