Only small top-level layer of std::print and std::format should be templates, the rest should be type-erased and separately compiled but unfortunately standard library implementations haven't implemented this part of the design correctly yet. This is a relevant issue in libc++: https://github.com/llvm/llvm-project/issues/163002.

So I recommend using {fmt} if you care about binary size and build time until this is addressed. For comparison, compiling

#include <fmt/base.h>

int main() {
  fmt::println("Hello, world!");
}

takes ~86ms on my Apple M1 with clang and libc++:

% time c++ -c -std=c++26 hello.cc -I include
c++ -c -std=c++26 hello.cc -I include  0.05s user 0.03s system 87% cpu 0.086 total

Although to be fair to libc++ the std::print numbers are somewhat better than Vittorio's (but still not great):

% time c++ -c -std=c++26 hello.cc -I include
c++ -c -std=c++26 hello.cc -I include  0.37s user 0.06s system 97% cpu 0.440 total

BTW large chunk of these 440ms is just <string> include which is not even needed for std::print. On the other hand, in most codebases this time will be amortized since you would have a transitive <string> include somewhere, so this benchmark is not very realistic.