Example: A freelance journalist communicating with sources should prioritize an app that minimizes logs and uses strong, audited encryption; an enterprise user may require support for corporate certificates or single sign-on. Connection stability, latency, and throughput vary by server quality and client implementation. Efficient handling of concurrent connections, reconnection strategies, and lightweight CPU/memory footprint are practical measures of quality. Benchmarks or user reports comparing performance across Windows and macOS clients can reveal optimization gaps.