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# Lazy Listeners
Lazy listeners are a new feature in version 3.0, provided to reduce the
performance overhead of fetching listeners and/or aggregates from a Dependency
Injection Container until they are actually triggered.
The feature consists of three classes:
- `Laminas\EventManager\LazyListener`, which provides basic capabilities for
wrapping the retrieval of a listener from a container and invoking it.
- `Laminas\EventManager\LazyEventListener`, which extends `LazyListener` but adds
awareness of the event and optionally priority to use when attaching the
listener. These are primarily used and created by:
- `Laminas\EventManager\LazyListenerAggregate`, which can take a list of
`LazyEventListeners` and/or their definitions, and be used as an aggregate
listener for attaching the lazy listeners to an event manager.
## Preparation
In order to use the lazy listeners feature, you will need to install
[PSR-11](https://www.php-fig.org/psr/psr-11/) Container, if you haven't already:
```bash
$ composer require psr/container
```
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