How to accelerate the linking time?

[zoujiaqing]

zoujiaqing at osx:~/projects/hunt-skeleton (*)
> time dub build                                                  
>                             master [fe3d6bc] modified
Performing "debug" build using /Library/D/dmd/bin/dmd for x86_64.
hunt 1.6.1: target for configuration "library" is up to date.
hunt-extra 1.0.0: target for configuration "library" is up to 
date.
hunt-net 0.5.1: building configuration "default"...
hunt-time 1.1.1: building configuration "library"...
hunt-proton 1.1.0-beta.3: building configuration "library"...
hunt-amqp 1.1.0-beta.4: building configuration "library"...
hunt-pool 1.1.1: building configuration "library"...
hunt-amqp-client 1.1.0-beta.2: building configuration "library"...
hunt-redis 1.2.0: building configuration "library"...
hunt-cache 0.8.1: building configuration "default"...
hunt-console 0.2.0: target for configuration "hunt-console" is up 
to date.
hunt-sql 1.4.0: target for configuration "library" is up to date.
hunt-database 2.1.0: building configuration "default"...
hunt-validation 0.3.0: target for configuration "library" is up 
to date.
hunt-entity 2.6.0: building configuration "library"...
hunt-http 0.6.2: building configuration "default"...
hunt-jwt 0.1.0-beta.1: target for configuration "library" is up 
to date.
hunt-security 0.4.0: target for configuration "library" is up to 
date.
hunt-shiro 1.1.3: building configuration "library"...
poodinis 8.1.0-beta.2: target for configuration "library" is up 
to date.
hunt-framework 3.2.0: building configuration "library"...
hunt-skeleton 3.1.0+commit.4.gfe3d6bc: building configuration 
"application"...
Linking...
To force a rebuild of up-to-date targets, run again with --force.
dub build  96.60s user 14.75s system 94% cpu 1:57.62 total


My laptop is MacBook Pro 15, but linking time so long.