For performance-sensitive GraphQL APIs, review the following areas:

• Detect and eliminate N+1 database access.
• Use request-scoped DataLoader where appropriate.
• Require bounded pagination.
• Add appropriate database indexes.
• Measure resolver and downstream latency.
• Control query depth and complexity.
• Cache stable data when justified.
• Avoid unnecessary downstream calls.
• Monitor expensive operations by name.

Performance optimization should be driven by measurements from realistic workloads.