As front-end developers, we often neglect the performance side of the application we are developing. Having an application that loads very slowly can cause our product to fail. Sometimes, we may not even know about those problems because of our local development setup. As a front-end developer at Wix, I have been facing performance related challenges constantly and learning from them. In this talk, I want to share my knowledge about those problems and explain best practices for solving them. We’ll do it together by opening a site, inspecting it and solving performance problems, one by one.