Hi, here is another release of KSP: https://github.com/google/ksp/releases/tag/1.4.20-dev-experimental-20201222 This release introduced an experimental incremental processing support, which can be enabled via the Gradle property 

ksp.incremental=true

. Logs can be enabled by 

ksp.incremental.log=true

. They are disabled by default so no worries :-) Incremental processing in KSP relies on processor's knowledge of how inputs are associated with outputs. Therefore, a new parameter is introduced to 

CodeGenerator.createNewFile

. There is also 

CodeGenerator.associate

 to associate inputs and outputs, in case the relation isn't clear when creating the outputs. This is an API change that breaks existing code. Please see the API for details. Please give it a try and share your thoughts! We need your help to improve the API.

This is great news! I’d be curious if you had any benchmark information for how much incremental helps compilation speed

Are there plans to add an example of an incremental processor? The documentation alone isn't the most obvious to me, like when associate would be used vs just using Dependencies in createNewFile

Yes, I'm working on examples and better documents.