I turned off constant polling in my automations, and Home Assistant finally ran cool

Home Assistant's constant polling can cause the system to run hot and respond slowly. Automations often check sensors and devices more frequently than necessary, even when there is no change in their state. To improve performance, it's recommended to switch from time-based triggers to state-based triggers in Home Assistant automations.

This means automations should run when a sensor's state changes rather than on a fixed schedule. For instance, instead of checking if a room is empty every few minutes, trigger an automation when the occupancy sensor detects that nobody has been there for two minutes. Similarly, for temperature-based automations controlling a fan, trigger them when the temperature crosses a certain threshold rather than constantly checking the reading.

Home Assistant also supports availability checks to avoid unnecessary communications with devices that are offline or have unknown states. This prevents wasted commands and cluttered logs. However, it's important to balance this with integrations that rely on polling to detect when a device comes back online. In terms of sensor readings, they can fluctuate, causing automations to react unnecessarily.

To avoid this, require a condition to stay true for a set amount of time before triggering an action. This is especially useful for washing machines or sensors that report power consumption. Additionally, consider adjusting the commit_interval in Home Assistant's Recorder to reduce disk I/O, but be aware of the risk of losing recent updates if the system crashes before committing.

By reviewing and optimizing automations, reducing unnecessary polling, and managing database recording, Home Assistant's performance can be significantly improved, particularly as the smart home grows in complexity.