rustling-ontology build isn't cache friendly

[idcmp]

I have a Rust project which takes three minutes for Cargo to build. Two minutes and 58 seconds of that is related to rustling-ontology. On a clean build, the training (build.rs) and regular (build) take a really long time.

Some people have suggested using sccache, which works for every other dependency I have except rustling-ontology.

Is there a recommended way with Cargo to use rustling-ontology (in my case, through snips-nlu-lib) in a project?