Who contributed to Elixir & Phoenix on August 17, 2026?

4 developers shipped this update, including tomciopp, preciz, lukaszsamson, and SteffenDE.

What were the notable Elixir & Phoenix updates?

Replace protocol dispatch with arithmetic in Access.slice/1, Optimize Time.compare/2, and perf: Add exact fast paths to Calendar.ISO.add_day_fraction_to_iso_days (#15759).

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The Wire · Showcase

ELIXIR CORE SHIPS CALENDAR SPEED SWEEP, PHOENIX LIVE VIEW FIXES UI STALLS

By RepoJournal · Filed 07:12 UTC on August 17, 2026 · About Elixir & Phoenix

4 people shipped this

tomciopp @tomciopp 3 cited

lukaszsamson @lukaszsamson 3 cited

preciz @preciz 2 cited

SteffenDE @SteffenDE

Three precision optimizations land in Elixir core with 1.75x speedups on date and time comparisons, while Phoenix Live View plugs a bug that was freezing UI for 200ms on zero-duration transitions.

The Elixir team is aggressively optimizing hot paths in the standard library. Date.compare/2 and Time.compare/2 both hit ~1.75x speedup [2] [4] by replacing tuple unwraps with direct tuple comparison, and Calendar.ISO is getting exact fast paths for day fraction addition [3] [5] that eliminate expensive gcd operations when denominators divide evenly. Access.slice/1 got a parallel treatment, removing per-element protocol dispatch overhead [1] by destructuring the range once and using integer arithmetic instead. On the Phoenix Live View side, JS.hide(..., time: 0) was silently coercing valid zero values to 200ms, locking the UI and stalling pending server updates [6] [8], now fixed. A second fix ensures runtime hook scripts that get replaced during DOM patching correctly track the connected node for afterAdded callbacks [7].

Action items

→ Pull latest Elixir main; these optimizations ship in the next release and require zero code changes elixir-lang/elixir [plan]
→ If you use JS.hide with time: 0 in Live View, pull the fix to stop UI stalls phoenixframework/phoenix_live_view [immediate]
→ Review any runtime hook afterAdded callbacks; verify they're not relying on detached nodes phoenixframework/phoenix_live_view [monitor]

References

[1] Replace protocol dispatch with arithmetic in Access.slice/1 ↗ elixir-lang/elixir
[2] Optimize Time.compare/2 ↗ elixir-lang/elixir
[3] perf: Add exact fast paths to Calendar.ISO.add_day_fraction_to_iso_days (#15759) elixir-lang/elixir
[4] Optimize Date.compare/2 ↗ elixir-lang/elixir
[5] perf: Add exact fast paths to Calendar.ISO.add_day_fraction_to_iso_da… ↗ elixir-lang/elixir
[6] Preserve zero-duration JS transitions ↗ phoenixframework/phoenix_live_view
[7] Fix runtime hook added node tracking ↗ phoenixframework/phoenix_live_view
[8] Preserve zero-duration JS transitions (#4385) phoenixframework/phoenix_live_view

Quick answers

What shipped in Elixir & Phoenix on August 17, 2026?: Three precision optimizations land in Elixir core with 1.75x speedups on date and time comparisons, while Phoenix Live View plugs a bug that was freezing UI for 200ms on zero-duration transitions. In total, 9 commits and 6 pull requests landed.
Who contributed to Elixir & Phoenix on August 17, 2026?: 4 developers shipped this update, including tomciopp, preciz, lukaszsamson, and SteffenDE.
What were the notable Elixir & Phoenix updates?: Replace protocol dispatch with arithmetic in Access.slice/1, Optimize Time.compare/2, and perf: Add exact fast paths to Calendar.ISO.add_day_fraction_to_iso_days (#15759).

Phoenix LiveView cleans up its act

Two upstream fixes in phoenix_live_view squelch lingering timers and stale submits that have been biting production apps.

elixir 6 shipped

Elixir & Phoenix Aug 16

ELIXIR CORE CUTS ALLOCATIONS ACROSS STRING AND AST OPERATIONS

Thomas Cioppettini landed four performance wins overnight that eliminate unnecessary allocations in List.myers_difference, String case conversion, and Macro tree walkers.

elixir 17 shipped

Elixir & Phoenix Aug 15

PHOENIX LIVE VIEW SHIPS UPLOAD OVERHAUL, ELIXIR TUNES CORE PERFORMANCE

SteffenDE landed five critical fixes for LiveView's upload handler in one sweep, while the Elixir core team optimized Version comparison and regex operations.