Hamlit is a high-performance implementation of the Haml templating language for Ruby. It focuses on speed optimizations through reduced string concatenation, static analysis via Ripper/Temple, and C-optimized attribute building. The engine uses the Temple framework to compile Haml templates into efficient Ruby code, with additional optimizations like string splitting and dynamic merging to minimize runtime object allocations. The architecture is modular, consisting of a core engine, parser (generated from Haml source), compiler, and filter system. It provides integration points for Rails (via Railtie) and framework-agnostic use through Tilt. A command-line interface is included for template compilation and rendering. The project also includes a C extension (hamlit.c and hescape.c) to accelerate performance-critical operations, with fallbacks to pure Ruby for compatibility with JRuby and TruffleRuby. While Hamlit's performance edge has diminished since Haml 6 incorporated similar optimizations, the codebase remains a well-crafted example of template engine engineering. It demonstrates strong practices in balancing performance with portability, and several components (such as the escape utilities, string splitter, and dynamic merger) are suitably reusable in other contexts. The project is actively maintained, with recent commits indicating ongoing support.