Because I find the numbers quite ridiculous, I changed the code locally for the advanced ropoport.
The input_flow_limit of 160 MW seems to cause this and I canged it to more sane 8 MW (twice the normal roboport).
Also, I reduced energy_usage from 4 MW to 200 KW (4 times the normal roboport).
The prototype is called fi_robo_port_entity in the file /prototypes/fission/fi_robo.lua if anyone else is interested.
Currently I'm playing "All The Overhauls Modpack".
Thanks for the input. The Re-Write for this mod is going slowly as it's a bigger one and changing one value from one thing could unbalance
other things and I am only talking about the plain 248k mod. I'll see how your values will fit in a current playthrough, maybe I take them over
if they are suiteable ;)