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@@ -64,6 +64,10 @@ def doWebpackStuff(webpackProcess: Process, sources: Seq[PathRef]): PathRef = ??
def compiledJavascript = T{ doWebpackStuff(webpackWorker(), javascriptSources()) }
```
+Mill itself uses `T.worker`s for it's built-in Scala support: we keep the Scala
+compiler in memory between compilations, rather than discarding it each time, in
+order to improve performance.
+
## Custom Modules
```scala