Faster?

I'm fucking back.
Just to pity to know that all of people that I know Use cout/cin in C++.
Big data has to be read in many tasks and I use exactly scanf/cout instead.
"Why is this so" you would ask. Just turn on you computer, test, test and test.
ohh, I know, that read and write functions even more FASTER! I saw how Tomas Chaika (great problems solver, works in Google ;) Yep, exactly in Google ) writes his own input output class using read, write. But it's so big! I mean a lot of additional lines... God, I might use Assembler to read/write MORE FASTER, but.. did you think it is good idea to ignore standart libraries stdio and iostream?