Hope someone can give me insight into the issues I am seeing with transfer speeds on my Pi4, as it would seem other people aren't having this issue, I have posted a video showing my issue here on YouTube - https://www.youtube.com/watch?v=JqxeldfxolY.

I have a gigabit lan connection, and am sure both devices are connected at gigabit level.

When transfering any files over 150mb to the internal SDCard, have tried two different ones

  • Samsung Evo plus 128GB Micro SD SDXC Class 10 memory card U3 100MB/S (MB-MC128HA APC)
  • SanDisk Ultra 200 GB microSDXC Memory Card Class 10, U1

Both performed the same, as can be seen on the first video, transfer starts off at 100mb/s and drops all the way to 0mb/s, and hangs, my Pi is also my DNS and PiHole server, during the time the transfer is hung at 0mb/s my whole internet hangs, so it would seem the Pi4 has frozen completly and is non responsive, then all starts working as it speeds back up.

The second copy on that video is me copying to an external Sata USB3 HDD plugged in via one of the USB3 ports on the Pi4, the transfer never hangs, and the system remains responsive, but the speeds fluctuate and never go above 35mb/s..

This all seems really strange to me, and I believe I should have better performance.

$uname --kernel-name --kernel-release --machine

Linux 5.10.17-v8+ aarch64

$cat /etc/os-release

PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION="10 (buster)"

Hope someone has some ideas.


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