D lang noted as having a very fast compilation time.

Playing with tiny web-interface apps I found that modern versions of dmd & vibe has such a fast compiling but a very long executable linking time.

Something like 2-3 seconds of compiling stage (with vibe prebuilt), and 24 seconds of total build time

dponyatov@i7:~/wad$ time dub build

     Pre-gen Running commands for openssl
    Starting Performing "debug" build using /usr/bin/dmd for x86_64.
  Up-to-date fswatch 0.6.1: target for configuration [library] is up to date.
  Up-to-date mir-linux-kernel 1.0.1: target for configuration [library] is up to date.
  Up-to-date taggedalgebraic 0.11.22: target for configuration [library] is up to date.
  Up-to-date eventcore 0.9.27: target for configuration [epoll] is up to date.
  Up-to-date stdx-allocator 2.77.5: target for configuration [library] is up to date.
  Up-to-date vibe-container 1.0.1: target for configuration [library] is up to date.
  Up-to-date vibe-core 2.6.0: target for configuration [epoll] is up to date.
  Up-to-date vibe-d:crypto 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:utils 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:data 0.9.7: target for configuration [library] is up to date.
  Up-to-date diet-ng 1.8.1: target for configuration [library] is up to date.
  Up-to-date vibe-d:stream 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:textfilter 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:inet 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:tls 0.9.7: target for configuration [openssl] is up to date.
  Up-to-date vibe-d:http 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:mail 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:mongodb 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:redis 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d:web 0.9.7: target for configuration [library] is up to date.
  Up-to-date vibe-d 0.9.7: target for configuration [library] is up to date.
    Building wad ~shadow: building configuration [application]
Compiling Diet HTML template index.dt...
Compiling Diet HTML template about.dt...
Compiling Diet HTML template error.dt...
     Linking wad
    Finished To force a rebuild of up-to-date targets, run again with --force

real    0m24.748s
user    0m19.133s
sys     0m2.565s

On Friday, 22 December 2023 at 19:12:14 UTC, Dmitry Ponyatov wrote:

Welcome to template bloat hell.

IIRC diet templates is very template heavy, it makes tons of (D) template instantiations and the linker has a lot of work because of that. It is even worse with LDC.

If there is runtime diet parser(which I doubt) instead of default render! template you can move diet to it to save on compile time.