https://github.com/RafaGago/mini-async-log
https://github.com/RafaGago/mini-async-log-c
I wrote both some time ago and AFAIK they were the fastest, how does nanolog compare against them?
At least before the source file preprocessor Nanolog was slower.
Here I had a benchmark project with Nanolog on an old version, maybe you can PR an update:
https://github.com/RafaGago/logger-bench