# \#warngroup

**URL:** https://forums.swift.org/tag/warngroup/1233.md

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## [Pitch: An opt-in warning for avoidable struct padding](https://forums.swift.org/t/pitch-an-opt-in-warning-for-avoidable-struct-padding/90128)

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**Author:** [@CodebyCR](https://forums.swift.org/u/CodebyCR)\
**Replies:** 5\
**Last updated:** [October 18, 2026, 7:43am UTC](https://forums.swift.org/t/pitch-an-opt-in-warning-for-avoidable-struct-padding/90128 "2026-10-18T07:43:29Z")

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Swift lays out stored properties in declaration order and never reorders them, so a poorly ordered struct silently wastes memory bandwidth. This pitch proposes an off-by-default diagnostic group that warns when reorderin…