During February 2026, Fulmlumo contributed to the rust-lang/rust repository by optimizing the inlining path within the MIR transform phase of the Rust compiler. Leveraging expertise in Rust programming and compiler design, Fulmlumo refactored the inlining process by removing a redundant call to check_codegen_attributes_extra, thereby reducing unnecessary overhead and streamlining code execution. This targeted change improved inlining throughput and contributed to faster compile-times, enhancing the efficiency of the rustc_mir_transform stage. The work demonstrated a focused approach to performance optimization, addressing a specific bottleneck and laying groundwork for future improvements in inlining-related compiler passes without introducing additional risk.