During February 2026, Matt Fuller developed a performance-oriented shader attribute for the microsoft/hlsl-specs repository, focusing on graphics and shader programming using HLSL. He introduced the 'numWaves' attribute for Compute and Amplification shaders, enabling explicit control over the number of waves per thread group. This addition allowed developers to optimize memory usage, reduce atomic operations, and improve cache coherency while maintaining backward compatibility with existing shader structures. Matt documented the feature with detailed design rules and implementation examples in Markdown, ensuring clarity for future adopters. His work demonstrated a deep understanding of shader architecture and performance tuning within HLSL specifications.