Redis and Intel teamed up to test whether applying more aggressive optimization options would improve overall Redis performance, concluding that yes, it did, with a 5.13% boost overall and more in some cases. They compared the impact of two popular open-source compilers, GNU Compiler (GCC) and Clang/LLVM, finding that GCC 9.4 + O3 -flto provided the best performance, outperforming the baseline by 5.19% with dependencies included and 5.13% without. The results showed significant variations across different use cases, with some tests improved by more than 20% over the baseline, while others showed worse performance or no change. The optimization techniques enabled by O3 flag can often be beneficial but also introduce additional overhead or make code less cache-friendly in some cases.