FS2 Internals: Performance
summary
FS2 0.10 (milestone8) claims major speedups: common take implementations run about 4–5× faster than 0.9 and some microbenchmarks jump from ~11k to ~50k+ ops/sec. It standardizes on Cats Effect IO, replaces Task, and simplifies APIs. Performance comes from staging via segments that compile fused operators to an imperative step machine, plus chunks and fusion to avoid intermediate allocations. The algebra becomes a single free C with a fail constructor to preserve resource safety while enabling async pools.
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chapters (12)
- 0:00Intro
- 0:44Functional Streams for Scala 0.10
- 1:56Ecosystem
- 7:29API Example: Exponential Backoff
- 11:040.9 Type Classes
- 12:110.10 Type Classes
- 14:15Variance Tricks
- 20:44Why Segments?
- 30:08Free with a catch
- 31:42Core Algebra
- 32:35Four Takes
- 37:18FS2 Internals
