Summary

• specialize DisplayEntities.spawnAll when a region contains exactly one spec
• preserve the existing visibility snapshot, spec spawn call, null filtering, entity identity, and immutable-list contract
• avoid the intermediate capacity-one ArrayList and subsequent copy for the 268 singleton regions in the representative table profile

Scope

Production candidate only: four added lines in DisplayEntities.java. No benchmark, threshold, workflow, dependency, or configuration changes.

Validation

All functional checks and benchmarking run only on GitHub. After Build/Test are green, this candidate will run the merged base-owned display-spawn paired A/B profile and may merge only if the final decision is PASS_OPTIMIZED.