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Previously, every call to `compile` in sbt with dotty took about the
same time because we created a new ClassLoader everytime and thus
thrased the JIT code cache, by reusing ClassLoaders we can make
`compile` about 2x faster.
You can reproduce this by running:
> dotty-compiler-bootstrapped/compile
This takes ~50 seconds on my machine. Then clean using:
> ;dotty-compiler-bootstrapped/clean;dotty-compiler-update
And run `dotty-compiler-bootstrapped/compile` again, this takes ~25
seconds for me. I get very similar timings from scalac (replacing
`dotty-compiler-bootstrapped` by `dotty-compiler`).
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