Accessibility and Performance
Web performance is all about making websites fast:?loading,?rendering, and?interacting. When pages load slowly or have a lot of content to load then the experience can be very clunky and unpleasant for all users. More resources to download mean also more data that needs to be transferred through the network and processed.
However, does poor performance of loading, rendering and interacting impact Accessibility?
To be able to interact with the page browser needs first to download all necessary resources like scripts, stylesheets, images, and other data. What is noticeable is sluggish interactivity for keyboard users and the screen reader loading progress because the browser is struggling with downloading resources and at the same time constructing the page based on what is available already.
One of the most impacted areas is the keyboard and screen reader navigation. A keyboard and a screen reader are very closely linked and in general (skipping touch devices) you can’t operate a screen reader without the keyboard. Anything that impacts keyboard navigation will most likely affect a screen reader user: sluggish usability, unavailable form controls, and focus being dropped because of dynamic changes on the page.
But how and what actually is happening behind the scene?
Read more in article https://www.sitelint.com/blog/accessibility-and-performance/