net speed

[Rein]

I have recently updated to Armbian Focal (Ubuntu 20.04).
My Banana Pi M1 is running an apache server + some digital amateur radio stuff.
So upload speed is important.
My average download and upload speed as measured with speediest-cli is 45Mb/sec and 18Mb/sec respectively (wired connection to modem)
With Focal I get these speeds with Buster (Debian 10) the download speed is still 45Mb/sec but the upload speed drops to 3.4 Mb/sec.
These results are not one off but consistent.
The am64 version of Buster does exactly the same thing..
My question is : can I change this with programming or is it a fixture in the kernel ?
Can someone enlighten me please ?
Rein

[Tido]

Providing logs with 

armbianmonitor -u

 significantly raises chances that issue is getting addressed.