Optimizing existing large codebase Modernice Mem threads low Code modernization Measuring Performance Code modernization Improving Memory Handling The nightmare of thread safety Low level optimizations Conclusion 13/62 S.Ponce-CERNOptimizing existing large codebase 13 / 62 S. Ponce - CERN Measure Modernize Mem threads low level c/c Code modernization 1 Measuring Performance 2 Code modernization 3 Improving Memory Handling 4 The nightmare of thread safety 5 Low level optimizations 6 Conclusion