Ben
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Ben
@mattbierner what are you using to test performance?
I think the problem is with the sizes (relaxed indices?) [here](https://github.com/nicolasstucki/scala-rrb-vector/blob/master/core/src/main/scala/scala/collection/immutable/rrbvector/RRBVector.scala#L2005) since we're prepending we can't reuse the existing cache, and must always rebuild it