Light Entity Class: Memory Optimizations
ESPHome 2025.11.0 introduces memory optimizations to the Light entity class that reduce both heap and flash usage. These changes affect external components implementing custom light devices and effects.
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Select Entity Class: Index-Based Operations and Flash Storage
ESPHome 2025.11.0 introduces significant optimizations to the Select entity class that reduce memory usage and improve performance. These changes affect external components that implement custom select entities.
Action Framework Performance Optimization
The core automation framework (actions, triggers, and conditions) has been optimized to use const references instead of pass-by-value for parameter passing. This reduces memory allocations by 83% in the automation execution path.
This is a breaking change for external components with custom actions or conditions in ESPHome 2025.11.0 and later.
Sunsetting support for IDF 4.x
At the beginning of this year, we made the transition from IDF 4.4 to IDF 5.1; this was a major upgrade and many changes were necessary within ESPHome to achieve this.
`*.*_SCHEMA` deprecations
In order to align all of the top level platform components (listed below), we are deprecating the *_SCHEMA constants that are present. Some examples are SENSOR_SCHEMA, SWITCH_SCHEMA and so on.
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