Optimizing existing large codebase Measire Modernice Mem threads lom Cleanup your code o While reviewing the code for converting to C++17: ●drop unused code 。drop unnecessary code e.g.do I really need to sort by hits here drop too generic APls if they are finally not needed replace virtual inheritance with templating when possible o consider dropping use of unmaintained libraries o It is very often surprising how much you gain there 15/62 S.Ponce-CERNOptimizing existing large codebase 15 / 62 S. Ponce - CERN Measure Modernize Mem threads low level c/c Cleanup your code While reviewing the code for converting to C++17 : drop unused code drop unnecessary code e.g. do I really need to sort by hits here ? drop too generic APIs if they are finally not needed replace virtual inheritance with templating when possible consider dropping use of unmaintained libraries It is very often surprising how much you gain there