chetanmeh edited a comment on issue #4509: Analyze OpenWhisk Scala compilation for performance URL: https://github.com/apache/incubator-openwhisk/issues/4509#issuecomment-500295549 So far my hunch is that higher compilation time is due to usage of [pureconfig][1] which internally uses [Shapeless][2] to automagically derive the config reader instances for our config case classes. Such a usage can [cause compilation slowness][3] as it relies on macros to synthesize the type classes during compile time. Latest version of pureconfig supports disabling such auto derivations and supports a [semi autoderivation][3] which I think can reduce the compilation time in a significant way. It may require us to add such implicit lookup manually like we do for Spray Json. Would see if it actually benefits or not [1]: https://pureconfig.github.io/ [2]: https://github.com/milessabin/shapeless [3]: https://pureconfig.github.io/docs/non-automatic-derivation.html#semi-automatic [3]: https://github.com/pureconfig/pureconfig/issues/396
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