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We save the device and entity registry to disk quite often, and the cost of serializing them to the storage can block the event loop for >100ms. Add a cache to reduce the change the loop is blocked at an inopportune time at run time. The first write after startup will still be a little slow but we do have to serialize the bulk of it at least once as there is no way to avoid this ``` 2024-03-14 11:28:19.765 WARNING (MainThread) [homeassistant.helpers.storage] Writing data with data_func: core.device_registry 2024-03-14 11:28:20.020 WARNING (MainThread) [homeassistant.helpers.storage] Writing data with data_func: core.entity_registry 2024-03-14 11:28:20.178 WARNING (MainThread) [asyncio] Executing <TimerHandle cancelled when=2319925.760294916 Store._async_schedule_callback_delayed_write() created at /Users/bdraco/home-assistant/homeassistant/helpers/storage.py:328> took 0.159 seconds ```
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