Two of my favorites:
code::dive conference 2014 - Scott Meyers: Cpu Caches and Why You Care: https://www.youtube.com/watch?v=WDIkqP4JbkE
CppCon 2014: Mike Acton "Data-Oriented Design and C++": https://www.youtube.com/watch?v=rX0ItVEVjHc
They're mostly about C++ and cache aware/data oriented programming.