Network maxxed out by Premiere

Since premiere version 25.0. it is eating up my whole ethernet connection to load footage(?) or to do nothing at all.

I get very large files downloaded onto my NAS on a daily basis and I edit them directly on the NAS that is connected to the same router as my PC. This has been working just fine for years but with the last update, when I drag a video into premiere, it immediately starts loading something which completely maxes out my ethernet connection and rendering any other internet usage on the PC impossible. Now, if that was only happening during the peak file generation process, I would understand, but it doesn't stop there. For no apparent reason with no actions going on inside premiere and without me doing anything it is still loading stuff through my ethernet. That even happens when I'm done editing and I send the file to media encoder. Premiere is still going nuts while ME only draws 50-200mbits. I can even close premiere to get rid of the problem which changes nothing about the rendering process or anything, but also if I don't close PP at some undefined point it just stops loading things and calms back down to 0 mbits - but I have no way of knowing what it is that causes it.

I can tell it is bottlenecking at my 1 gigabit router because my motherboard does have 2.5gig ethernet.

Now I have absolutely no trust in this ever getting changed or fixed (especially given that even the most basic things such as the masking feature inside PP have been horrendously abysmal since forever) but is there a way to limit the bandwidth that PP is using?