Windows 11 Ethernet not reaching max speeds

[YorrickBouma]

We recently switch form provider, because we have fiber internet now. But for some reason I don't reach the 1Gbps speed using ethernet. The problem isn't with our provider (see figure 1 and 2). The ethernet cable isn't the problem either, I first used a cat 5e cable and switched to a cat 6 cable but the results where the same. I checked my ethernet adapter (Killer E2600 Gigabit Ethernet Controller), which says the speed is 1Gb/s (figure 3). But for some odd reason my download speed is just ~120Mbit/sec, while my upload is ~140Mbit/s (figure 4). I tried reinstalling the drivers, changing some a

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