Fritz!Box 4040 experiences

2x2 802.11ac/ wave2 results in a gross link rate of 866 MBit/s, the usable net rate of that will be around half of that at most. 300-350 MBit/s in practice is about the most you can expect from hardware like this (the interrupt handling alone will keep the CPU pretty busy; actually your wired speedtest results are already beyond my experiences with this hardware) - for (considerably) more you'd need 802.11ax/ wifi6 hardware (and/ or at least 3x3 or 4x4 clients (and APs)).

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