I´ve read that this call before any use of streams will improved performance because it breaks the sincronization of C++ with C on io operations.
questions:
1) It improves the performance only on stardard streams (cerr cin and cout), or any file will have the performance improved?
2) since I use it I can´t make anymore any call to C standard streams (of course only if I call it again with true as parameter) Is this correct?

Thank you.