GraphQL enhances web application performance by allowing developers to combine multiple queries into a single request, reducing network latency compared to traditional REST APIs. This approach shifts the bulk of data processing to the server, streamlining client-side logic, and reducing bugs. The article discusses practical methods for combining queries, such as using aliases to manage naming conflicts and employing interfaces and unions to query different types efficiently. It also explores how to integrate multiple GraphQL APIs using techniques like schema stitching, federated GraphQL, and API aggregation. Additionally, GraphQL's flexibility in handling nested content models makes it particularly suitable for content management systems like Contentful, which supports features like filtering, pagination, and draft previews.