Batch performance suggestions

[davesmith00000]

You might get a quick and easy performance boost by making it a sealed abstract class instead of a sealed trait.
That would make the access to the private lazy val monomorphic.

So says @sjrd.

Try it. Benchmark it. Sounds like a fun task to me. :)

[davesmith00000]

Benchmarks, before:

[davesmith00000]

Benchmarks, after:

[davesmith00000]

I'm calling that inconclusive. I'll have to re-run with more iterations to get more stable numbers. Notice that List is jumping about and it shouldn't be.