The GraphQL API has been enhanced with three new features: nested filtering, automatic persisted queries, and increased complexity limits. Nested filtering allows developers to filter data that is nested within another data type, reducing the amount of data that needs to be downloaded and processed. Automatic persisted queries enable requests to exceed the 8kb limit by storing only a hash of the query along with the original query, reducing request size and allowing caching. Increased complexity limits have been set at 11,000 entities per request, which can be increased upon request to Contentful, supporting more complex data structures and use cases. These enhancements aim to improve performance, simplify frontend development, and empower developers to create more performant applications.