The TLDR is that Nginx offers about x2 more throughput than Caddy.
[1] https://caddy.community/t/nginx-vs-caddy-benchmark-video/261...
> Go programs are fast enough for Google, Netflix, Stripe, and many other large Internet companies… it’s probably fast enough for you
Which of course is an appeal to authority. Overall, it's pretty well known that a GC language will have downsides in perf when compared to system programming languages.