Performance Optimization Techniques

For large JavaScript objects, using a specialized clone library or the native structuredClone() method (available in modern browsers) is typically the most efficient approach. structuredClone() provides true deep cloning with better performance than JSON.parse(JSON.stringify()) and support for circular references and a wider range of built-in types. While Object.assign() and the spread operator are fast, they only create shallow clones, copying only the top level of properties. JSON.parse(JSON.stringify()) creates deep clones but has several limitations: it's relatively slow for large objects, loses non-JSON data types (functions, undefined, symbols, etc.), doesn't handle circular references, and can cause precision issues with certain numbers. For complex objects with specific requirements, specialized libraries like lodash's cloneDeep or immer may offer the best balance of performance, correctness, and feature support.