Yuyang Xie contributed to the openjdk/leyden repository by engineering improvements to benchmarking infrastructure and reliability over a two-month period. He refactored the JMH benchmark configuration, replacing legacy JVM argument handling with a unified approach to ensure consistent and reproducible performance measurements. Using Java and the JMH framework, he also addressed stability issues in vector operation benchmarks by correcting array indexing logic, which resolved an IndexOutOfBoundsException and hardened the test setup. His work focused on enhancing the accuracy and reliability of performance testing, enabling faster validation of changes and supporting ongoing optimization efforts within the JVM and Vector API domains.