I am working on a Kotlin project that takes surprisingly long to compile and I would like to figure out what takes so long. The project has about 16500 lines of Kotlin code and takes about 2 minutes to compile on my laptop (Ryzen 7 4570U, 32GB Ram). I already identified a few possible culprits but have not seen dramatic improvements so far:
- Reduce number of classes drastically (went from over 4000 (lots of inline lambdas) down to a few hundred)
- Split up code into more but smaller files
- Upgrade from kotlin version
1.4.21(that actually made it a little slower)
The project adds extension functions and operator overloading to a Java image processing library that makes extensive use of recursive generics. I could imagine that those recursive generics pose a significant challenge to the compiler.
Is there an option to profile the time spent on individual files/classes/functions with the Kotlin compiler or, even better, gradle?