Worked on performance optimization within the Qiskit/qiskit repository, focusing on the Synthesis and Transpiler modules. Addressed inefficiencies by removing unnecessary intermediate collections and enabling lazy evaluation, which reduced memory allocations and improved performance for large quantum circuits. The approach involved refactoring Rust code to resolve clippy::needless_collect warnings, enhancing both code quality and maintainability. Changes spanned critical areas such as delta_phase calculation and component_qubits, ensuring more efficient memory usage. This work demonstrated a strong emphasis on code refactoring and performance optimization, contributing to the long-term scalability and reliability of the Qiskit codebase without introducing new bugs.