This board may have a significant grounding or EMI issue.

If you experience poor performance when PSRAM is enabled, such as the web UI taking 20 seconds to load in the browser or camera lag, you can try a workaround:

Plug the board into a breadboard, making sure that each pin does not connect to any others, in order to shield the external pins. Additionally, apply pressure to the ESP shield with your finger. The performance should return to normal within a couple of seconds.

Solution found by @levak

The UART converter on this board requires DTR and RTS to be disabled in order to receive Serial output.

In Platform.io, add the following lines:

monitor_dtr = 0
monitor_rts = 0

Or if using arduino-cli, use the following arguments:

$ arduino-cli monitor --port COM5 -c baudrate=115200,rts=off,dtr=off

Arduino IDE does not support this board invidually and hacking the system files feels too much efforts. An easy workaround is to temporarily switch to “ESP Dev Module” when debugging and switch back to “ESPS3 Dev Module” when compiling.

Solution found by @levak