未搭载 PSRAM 的 ESP32-DevKitC 开发板，Wi-Fi 和 ESP-BLE-MESH 共存可以正常运行，但是吞吐率较低。当 Wi-Fi 和 ESP-BLE-MESH 共存时，搭载 PSRAM 的 ESP32-DevKitC 速率可以稳定在 1 Mbps 以上。

应使能 menuconfig 中的一些配置来支持 PSRAM:

ESP32-specific --> Support for external,SPI-connected RAM --> Try to allocate memories of Wi-Fi and LWIP...

Bluetooth --> Bluedriod Enable --> BT/BLE will first malloc the memory from the PSRAM

Bluetooth --> Bluedriod Enable --> Use dynamic memory allocation in BT/BLE stack.

Bluetooth --> Blutooth controller --> BLE full scan feature supported.

Wi-Fi --> Software controls Wi-Fi/Bluetooth coexistence --> Wi-Fi