During July 2025, Justin Tong focused on stabilizing the KV cache offloading path in the JustinTong0323/sglang repository by addressing a critical bug related to CPU copy operations. He implemented the missing get_cpu_copy functionality by adding CPU copy methods to the PagedTokenToKVPoolAllocator, ensuring proper KV cache behavior during offload mode. This Python-based solution improved memory management and performance optimization, reducing failures under high load and enhancing overall reliability. Although the work centered on a single bug fix rather than new features, the depth of the change demonstrated strong debugging skills and a thorough understanding of complex cache management challenges.