@markv after the update, it would be worth checking your router's bufferbloat grade, as some users have reported poor latency with the 7530 AX on their xDSL connections.
To test your router+FTTC combination, run the Waveform test, and hope that you get a bufferbloat grade of "A+", "A" or "B"
If not, users have posted solutions for the 7530 AX, that go along the lines of this -
The hardware-accelerated packet acceleration has been faulty for quite some time on pretty much all DSL and cable models from the past five years or so. The fix is to go to the support menu under fritz.box/support.lua Scroll down to packet acceleration. Keep it on, but uncheck hardware-accelerated packet acceleration and click the button to save the settings. I've had the exact same issue with the 7590 AX. The CPU load increases, yes, but the full bandwidth of a DSL connection (even 250 Mbit/s connections) is still available. The 7530 AX actually has a stronger CPU, so it shouldn't have any issues, but the buffer bloat goes to near-zero. Warning: You'll need to set the setting again after every update or other reboot, because the setting is not persistent and gets reset after a reboot.
