https://devzone.nordicsemi.com/f/nordic-q-a/67863/usb-data-throughputHi, I am using the USB CDC example in my project, where I developed my own application level communication protocol. I have a problem with the data throughput, it&#39;s lower than I need. Any suggestions please ? Can I use the USBD_MSC instead ofen-USTelligent Community 13Mon, 02 Nov 2020 12:44:49 GMThttps://devzone.nordicsemi.com/thread/278061?ContentTypeID=1Mon, 02 Nov 2020 12:44:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5a398ad2-d8f5-4237-8602-ec1ba2904a64Simonr<p>Hi JK</p> <p>If you check out <a href="https://devzone.nordicsemi.com/f/nordic-q-a/23754/which-usb-class-should-i-use-for-maximum-data-rates-on-nrf52840-and-what-is-the-maximum-size-of-transfer-if-i-use-cdc_acm">this case on maximum USB data rates for the nRF52840</a>, you can see that our tests suggest that you should be able to reach ~2Mbps over USB. What kind of speed are you seeing now, and what do you need/expect?</p> <p>You can try setting APP_USBD_CONFIG_EVENT_QUEUE_ENABLE to 0 in sdk_config.h, and remove the call to app_usbd_event_queue_process() in the while loop of main()? That way we can check if it is the USB packet queueing that is holding up the data transfer.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>