[PROBLEM] RPi B4 slowdown with using USB 3.0

[Nutul]

The symptoms below suggest something external to moOde software for example a bad uSD card, network issue, hardware issue etc.

Code:

"Even a mouse stick causes a practical loss of responsiveness. Connecting mass storage to this ports means that playback is interrupted while browsing the library and practically not possible to use resampling."

To troubleshoot try an initial configuration:

1. Fresh moOde 8.3.3 64bit image
2. Known good uSD card
3. Ethernet connection
4. Power up and verify no issues

Then one at a time change the configuration for example switch to WiFi, add USB storage device, turn on resampling etc to see if any one change produces the the issue.

1. Fresh moOde 8.3.3 64bit image

This issue is version independent of Moodeaudio (say versions 7 up)


2. Known good uSD card

Checked, it is not related to the brand and the copy of the SD card. I've only been using SDXC cards recently, but this also happened with SDHC cards. Card manufacturers include Samsung, Sandisk.


3. Ethernet connection

Ethernet and basically the network interface has no effect. Only using anything connected to USB 3.0 ports generates a problem.


4. Power up and verify no issues

But the same devices (USB drive, stick to mouse) connected to USB 2.0 ports and the problem disappears. The current consumption is the same for these connected peripherals. 

Having had another DAC extension with a solid power jack, I could tell that in the absence of undervoltage detection, this issue still persists.

I'm leaning that it's a hardware problem in the Raspberry Pi itself, I only have a copy from the first series of the 4B model. Availability of the Raspberry PI is practically zero, the prices are close to the cost of buying a fanless PC and with it I get a disk interface, fast LAN, fast WiFi, fast USB.
The only downside to using a PC is that there is no Moodeadio release for the x64 platform. If it was, I would like to add that only support for USB DACs is enough.

Could it be an incompatibility issue between the device's USB3 and the Pi USB3? I also have a Pi4, and I believe my version is 1.1, I have no problem connecting my external DAC to any of the USBs, be it 2 or 3.
If using the USB2 ports solves the issue, then be it, as getting a more recent Pi4, as you state, is out of discussion. AFAICT USB2 has no disadvantage for connecting a DAC...