When implementing algorithms, prioritize using standard library functions over manual implementations when they provide equivalent or better performance. The standard library is typically optimized and well-tested, making it a more reliable choice for common operations. For example, instead of manually copying map entries: ```go // Avoid manual iteration for k, v := range m { c[k] = v } // Prefer standard library function maps.Copy(c, m) ``` Similarly, for string operations, the standard library is often more efficient: ```go // Use strings.ToLower() instead of custom utilities origin := strings.ToLower(c.Get(fiber.HeaderOrigin)) ``` This approach reduces code complexity, leverages optimized implementations, and improves maintainability. The standard library functions are particularly efficient when input data is already in the expected format, as noted: "standard lib is faster if it is already lower case, which should be the case in most cases."