How Not to Write Slow Scala
summary
Benchmarks use SBT jmh and the repo shows concrete numbers: prepending to lists is often fastest while appending to Seq can be twice as slow, arrays of primitives are byte‑packed and run an order of magnitude faster than boxed collections, Stream and some functional chains do not fuse so Iterator wins for lazy fusion, Vector pays construction cost unless built with a VectorBuilder, and careless patterns with Future or mapValues produce 10x–1000x slowdowns in real cases.
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