Worked on the oxcaml/oxcaml repository to deliver a targeted performance improvement in the register allocator by refactoring range handling through a new Cursor API. This approach replaced the previous method of managing range overlap and liveness checks in a doubly linked list, reducing memory allocations on the hot path and improving garbage collection efficiency. The work focused on compiler development and low-level optimization using OCaml, emphasizing data structure refinement to eliminate intermediate cell allocations. By preserving correctness while addressing allocation churn, the changes enhanced runtime efficiency in the allocation phase and contributed to more maintainable and performant compiler infrastructure.