Who contributed to Elixir & Phoenix on June 15, 2026?

2 developers shipped this update, including preciz and rhcarvalho.

What were the notable Elixir & Phoenix updates?

Optimize URI.to_string/1, Optimize unpercent with guard and by avoiding with clause, and Optimize bag_distance by calling bag_difference only once.

Jun 15, 2026

$ the-wire · showcase

ELIXIR RUNTIME GETS SWEEPING PERFORMANCE OVERHAUL WHILE PHOENIX TIGHTENS 1.20 COMPATIBILITY

By RepoJournal · Filed 06:04 UTC on June 15, 2026 · About Elixir & Phoenix · Composed from the cited sources · methodology

2 people shipped this

preciz @preciz 5 cited

rhcarvalho @rhcarvalho 2 cited

The core Elixir library shipped five targeted optimizations overnight that collectively eliminate redundant computation across URI handling, string operations, and set algorithms, while Phoenix and LiveView align their tooling with Elixir 1.20's stricter compiler warnings.

Elixir's standard library landed a coordinated optimization sprint that rewires frequently-used functions for both speed and memory efficiency. URI.to_string/1 now destructures once instead of repeatedly updating maps [1], while the unpercent decoder switched from with-clause overhead to guard-based pattern matching for cleaner bytecode [2]. String.bag_distance/2 eliminated a redundant full-pass computation and cut execution time by 25% on short inputs [3], and MapSet.symmetric_difference/2 flipped its iteration strategy to fold over the smaller set, yielding over 100x speedup when sizes mismatch [4]. These aren't flashy features but they're the kind of surgical improvements that compound across millions of production calls. On the Phoenix side, the framework removed deprecated xref configuration in favor of Elixir 1.20's new elixirc_options directive [5], silencing compiler warnings while maintaining the same behavior for optional dependencies. LiveView's assign_stream function got a 3-4x speedup for bulk insertions by batching operations on the LiveStream struct instead of updating the Socket on each iteration [7]. Documentation across both projects shifted to ExDoc's native admonition blocks for cleaner rendering [6] [8].

Action items

→ Update Phoenix to latest patch to clear Elixir 1.20 compilation warnings phoenixframework/phoenix [plan]
→ Pull latest Elixir 1.20.x for URI and set operation speedups in your datapath elixir-lang/elixir [monitor]
→ Update LiveView if you're doing heavy stream insertions in real-time features phoenixframework/phoenix_live_view [monitor]

References

[1] Optimize URI.to_string/1 ↗ elixir-lang/elixir
[2] Optimize unpercent with guard and by avoiding with clause ↗ elixir-lang/elixir
[3] Optimize bag_distance by calling bag_difference only once ↗ elixir-lang/elixir
[4] Optimize MapSet.symmetric_difference/2 when sizes mismatched ↗ elixir-lang/elixir
[5] Use elixirc_options: [no_warn_undefined: ...] instead of xref: [exclude: ...] (#6715) ↗ phoenixframework/phoenix
[6] Replace internal docs references .html -> .md ↗ phoenixframework/phoenix
[7] Optimize assign_stream by batching LiveStream insertions ↗ phoenixframework/phoenix_live_view
[8] Replace adhoc docs "Notes" with admonition blocks ↗ phoenixframework/phoenix_live_view