Shopify’s journey to faster breadth-first GraphQL execution (2026) - Shopify

What this post added

Introduced GraphQL Cardinal, a new breadth-first execution engine for GraphQL. This engine resolves fields once per field across all objects, contrasting with the traditional depth-first execution model. The post details the hidden costs of depth-first traversal, including linear scale and field-level overhead, and presents the breadth-first hypothesis and its implementation in Cardinal. Benchmarks show up to 15x faster CPU-bound execution and 90% less memory usage for large list queries. The post also discusses the migration of a large production stack to this new execution model.