This is my first time setting up a Raspberry Pi4 (8GB). Before, I have used a RPi 3B for some other things. From what i have read is, that IO performance should be a lot better on the RPi4, as with the RPi3B. But i get the same speeds as before. I have setup the following:
Installed Raspbian Lite (64bit)
enabled SFTP/SSH
Setup a user for SFTP only access, with home on a connected USB HDD
From the speed you mention this looks a lot like 100mbit, is there perhaps any device in the chain that only has a 100mb lan port? The pi should have gigabit
Not really. There is only a Switch with GBit and standard FritzBox 7590 as a Router. The Switch is connected to the Router on the WAN Port as it should be (if i remember right) and the RPi4 to one of the Switch ports. The Laptop is directly connected to the router. The cable is a standard GBit cable. There should be nothing with 100MBit.
Versuch Mal einen anderen LAN Port für deinen Switch an der Fritzbox, es muss nicht WAN sein - der Port wird in diesem Fall sowieso nur einfach als normaler LAN Port fungieren. Ich habe schonmal gelesen das es da manchmal Probleme gibt: