The Apollo Client 3 caching system is a core feature of the framework, providing a normalized cache that speeds up GraphQL query execution and improves responsiveness. The new version addresses several pain points from previous versions, including lack of cache eviction capabilities and inconsistent configuration APIs. Apollo Client 3 introduces a unified cache configuration strategy with fine-grained control over cache interactions, including garbage collection and cache eviction methods (`cache.gc()` and `cache.evict()`), streamlined cache configuration through the type policies API, and the ability to disable normalization for certain types. Additionally, the new caching system includes improvements such as reference-ID-based approach for generating local IDs, support for fragments with unions and interfaces, and immutable cache results by default. The Apollo Client 3 beta is available now, and users are encouraged to test it out and provide feedback.