That only helps if the code is well segregated by usage. Looking at the ELF symbol table for prometheus-2.33.0-rc.1.linux-amd64, it's not clear to me this is the case. Not sure how it's ordered. Lexical import order? Anyhow, without profiling how could the compiler know how to order things optimally?

I think this is one of those cases where, in the absence of profiling or some other hack (e.g. ensuring all routines within a library are cleanly segregated across page boundaries within the static binary and the I/O scheduler doesn't foil your intent), dynamic linking would prove superior, at least for such large amounts of code.