The PCB antenna used on ESP-WROOM-02 is a Meandered Inverted F Antenna (MIFA) for the
2.4G Wi-Fi band with an antenna gain of 2 dBi.
The same antenna here.
So i answered my question by myself.

Hello. What is the gain of esp32-s3-wroom-1 PCB antenna?

I found the problem. I cut data to chunks of 4k and it works fine.

I made a firmware updater inside my device and got very poore speed of firmware writing. It takes 28 minuts to write 1.3 MB from memory to flash inside esp32s3.
Is it OK or i can make the speed normal?

I made some tets code. And got 70 seconds for receiving 1 MB of data and 2.5 second of transferring 1 MB of data.

But i made 4096 bytes of tx buffer size and its works fine.

Hello. I am working with ESP32S3 USB virtual com port and trying to increase size of RX transfer buffer size. Right now its only 64 byte and speed of transfer is very low. I set TX buffer to 4096 and its much much more faster. I tryed to change CDC FIFO size of TX channel, Largest size (in bytes) of...