$ /usr/bin/time boot build target -d target
Compiling 1/1 test-proj.core...
Writing pom.xml and pom.properties...
Adding uberjar entries...
Writing test-proj-0.1.0.jar...
Writing target dir(s)...
     1632.47 real        40.66 user       364.85 sys

$ lein clean && /usr/bin/time lein uberjar
OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
Compiling test-proj.core
Created /<redacted path>/test-proj/target/uberjar/test-proj-0.1.0-SNAPSHOT.jar
Created /<redacted path>/test-proj/target/uberjar/test-proj-0.1.0-SNAPSHOT-standalone.jar
       15.32 real        27.59 user         5.09 sys

10GB in your project? OMG that would probably murder the hard drive, boot tasks copy the project dir to their own temp folder, this could result in huge hard drive usage

you should probably break up the project into smaller modules

unless the test data is something like a database, then you just need to filter the fileset to remove it

Thanks, but I tested this without having the test data in the project base dir.

Additionally, target dir is ~23 MB so I don't think it's copying those 10GB test data.

Unless it's copying and discarding of course. This is on nvme drives, so it takes ~20s to copy that data.