Compilation and execution time of C++ vs C source code

I am not sure if this is a valid comparison or a valid statement but over the years I have heard folks claiming that the programs written in C++ generally take a longer time for compilation than the same written in C and that the applications coded in C++ are generally slower at run time than ones written in C.
Есть ли правда в этих утверждениях?
Apart from reaping the benefits of OOP flexibility that C++ provides, should the above comparison be given a consideration purely from a compilation/execution time perspective?

I hope that this doesn't get closed as too generic or vague, it is just an attempt to know the actual facts about statements I have been hearing over the years from many programmers(C programmers predominantly).