Can the sidebar or widget slow down the loading of my website?

Tools like GTmetrix and WebPageTest can be used to measure how long individual source files of a Web site take to load. When our sidebar or widget are visible there, it doesn't mean that this slows down the loading of the site. That's because our sidebar and widget load asynchronously. That means that the loading happens "in the background" while the loading of the rest of your website continues. If you do have a measurement that really shows that your site is slowed down by our integrations, we would like to hear from you. In that case, please include a link to the measurement.