Try out clang's ThinLTO
https://clang.llvm.org/docs/ThinLTO.html
Might fix clang's slowdown.
Related: https://www.reddit.com/r/cpp/comments/1caarda/the_performance_impact_of_cs_final_keyword/l0rwu7q/
Edited by Benjamin Summerton
https://clang.llvm.org/docs/ThinLTO.html
Might fix clang's slowdown.
Related: https://www.reddit.com/r/cpp/comments/1caarda/the_performance_impact_of_cs_final_keyword/l0rwu7q/