Developed and delivered a targeted performance testing feature for the intel/sycl-tla repository, focusing on the Llama3 70B Flash Prefill Test Configuration. This work involved enhancing the TestFlashPrefillAll function to accept a configuration string, enabling the specification of distinct problem sizes for the Llama3 70B scenario. A new test case, Llama3_70B, was added to xe_flash_prefill.cpp to exercise and validate the new configuration pathway. The implementation leveraged C++ for both performance optimization and robust testing, providing a flexible testbed for evaluating flash attention mechanisms under varying workloads without introducing any bug fixes during the development period.