According to the API documentation esp_mesh_send() is not reentrant. You can use it in multiple tasks, with e.g. mutex, but then it will still be sequential. So, I would say the answer is 'no'.

I have been trying a similar thing on the ESP32-S3-WROOM-1U P1N8R8, using IDF 4.4.2 and I confirm the issue. My conclusion is: - the documentation seems incorrect : the PSRAM is not mapped at 0x3D000000 - it is mapped at 0x3E000000 - size(PSRAM) = 0x3D800000 in my case, works fine like that :) - the...