Couchbase Server 5.0 introduces advanced profiling capabilities for analyzing N1QL query performance, providing detailed metrics on execution phases and operators, allowing database administrators to optimize slow queries. Profiling can be enabled at various levels, such as request, service, or on-the-fly, offering insights into the execution tree with statistics like time spent per operator, documents processed, and operator state changes. This detailed data assists in identifying and resolving bottlenecks, such as high kernel time or inadequate index selectivity, which can cause slow query performance. Profiling information is accessible through system keyspaces and can be visualized in the Query Workbench, aiding in performance monitoring and troubleshooting. While profiling offers valuable insights, it requires mindful management to prevent excessive memory usage, particularly when logging extensive execution timings for all queries.