The Performance Price of Virtual Functions

Virtual function mechanism is one of the core concepts of C++, however, it does come with a performance price. But how high is that price? 

In this talk we are going to dissect virtual functions to understand when they are slow and why they are slow. We will investigate how well virtual functions use the CPU's underlying resources and how good is the compiler at optimizing virtual functions. We will also present several techniques to help you speed up your program using virtual functions.


Ivica is a Application Performance Expert with 10 years of experience active in the domain of Linux and bare-metal embedded systems. His professional focus is application performance improvement - techniques used to make your C/C++ program run faster by using better algorithms, better exploiting the underlying hardware, and better usage of the standard library, programming language, and the operating system. He is the writer for a performance-related tech blog: