71M requests per second gives you about 14ns per request. WolframAlpha says that's about 4 times the latency of a L2 cache access and 0.8 times the latency of a Mutex lock / unlock: https://www.wolframalpha.com/input?i=1+second+%2F+71+million. So even if you have a massive amount of cores in that machine, you still don't really have much time to spend on a single request and a single mutex operation will exceed your budget.

For comparison: HAProxy was able to deal with 2M requests per second on a single machine in 2021: https://www.haproxy.com/de/blog/haproxy-forwards-over-2-mill... (Disclosure: I'm a HAProxy community contributor).