RPi 4 very slow to non existent ETH

[Liam]

Hi Andrew,

I’m not the networking guru but might be able to get you started at least
Other Makers report that doing the following may help:

• Removing as many USB and GPIO peripherals as possible
• Ensuring that the switch/router has identified that ethernet interface as a full gigabit connection
• Try flashing a new Pi OS instance onto a microSD card and testing from a fresh install

This topic touches on a few possible improvements with a successful outcome:

Painfully Slow Raspberry Pi Zero W Internet Speeds

Just configured my Raspberry Pi Zero W ordered on # 100139504. Loaded using Noobs and Raspian Image - no difference on Sandisk and Samsung micro SD cards. When doing a sudo apt-get upgrade it took over 30 minutes most of this downloading time. As an example a 220Mb file took over 10 minutes at about 300Kb/s. Trying to open YouTube on Chromium will sometimes time out and if it does connect it cannot playback video at the lowest resolution. Running speedtest.net gets between 1 and 3 Mb/sec on …

Are you able to paste in any speed test outputs? If they clamp at a distinct speed we might be able to determine whats causing issues there!
Liam