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packages/core.yaml sets wifi: power_save_mode: none. ESPHome merges it under the screen's own wifi: block, which keeps the network, the password and the hotspot, and the screen's own YAML still wins on the mode. The YAML ESP Screens writes has had the line since app 0.2.24; screens with an older or hand-written YAML ran ESPHome's ESP32 default light, and their messages from Home Assistant waited 76-117 ms on the bench. esphome config on the bench screens' Device Builder YAMLs: NONE for both without a line of their own, LIGHT when the YAML says light. The bench Guition, flashed from its Device Builder YAML: ping 15 ms average instead of 117 ms. tools/check.sh: 474 Python tests (a new one keeps the core's wifi: block to this one key), 19/19 C++, editor; firmware unchanged in size (CYD 1,678,816 B, 91.5 %; Guition 2,055,280 B), since the checkout profiles already had the line. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>