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Turning on fsc might help (it sets the Scala compiler up as a daemon / service rather than starting it from scratch every time). In Scala facet of your project:

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click "Use project FSC", then click Settings and select a compiler library for fsc.

If you're doing a larger project you probably want to use sbt to manage your build, as it does incremental compilation. IDEA has a good sbt plugin you can try.

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