Month: 2025-11. Overview: OpenSSL (openssl/openssl) delivered a high-impact performance optimization for base64 encoding by introducing AVX2-based encoding with scalar fallbacks to preserve compatibility across architectures. This work significantly increased encoding speed and reduced CPU usage for common data-paths used in TLS and data handling. Major bugs fixed: none recorded this month; ongoing work focused on performance path hardening and compatibility. Overall impact: improved throughput and energy efficiency for encoding workloads, contributing to faster handshakes and lower operating costs in performance-sensitive deployments. Technologies/skills demonstrated: vectorization with AVX2, performance profiling and optimization, cross-architecture compatibility, and rigorous code review and collaboration (PR 29178; reviews by Dmitry Belyavskiy and Paul Dale).