Doing some testing today, disabled SQM, and turned on software and hardware flow offloading.
Archer C7 V2, on a 50/50 fiber connection.
I was surprised at the results...
htop showed the CPU didn't go over 19%
There is no hardware flow-offloading on ath79 yet (maybe never), so at best that setting doesn't do anything. While software flow-offloading should work on all hardware, I'm not so positive if your observed CPU usage really indicates it being at work - the c7-v2 should be able to do around (just under) 200 MBit/s routing without any offloading in place (100% CPU usage, and choppy under that kind of load), at 50 MBit/s 19% CPU usage shouldn't be that far away from the expected values (~25%, more or less).
On the plus side, your router is too fast for your WAN speed 
Why I put the question mark at the end...
Not for long...
Speed tier jump sometime this year.
LAN-to-WAN speedtest on a Western Digital N750 running 23.05.4 (LAN and WAN interfaces are 900+ Mbps without device):
Idle Latency: 9.95 ms (jitter: 0.04ms, low: 9.93ms, high: 10.00m
Download: 331.09 Mbps (data used: 170.6 MB)
14.74 ms (jitter: 7.21ms, low: 7.35ms, high: 241.47
Upload: 171.87 Mbps (data used: 176.7 MB)
23.95 ms (jitter: 1.67ms, low: 15.73ms, high: 45.69
Packet Loss: 0.0%
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