EdgeHTML engine improves input responsiveness in Microsoft Edge


Radu Tyrsina
by Radu Tyrsina
Founder & Editor-in-Chief
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Web pages are becoming more reliant on JavaScript for core functionality, moving further to the client side. With the Creators Update and EdgeHTML 15, Microsoft Edge’s usability, responsiveness, and performance of the web are all improved.

Best-in-class scrolling performance and input prioritization

Microsoft Edge offers best-in-class scrolling performance because most scrolling devices can be handled on a background thread. Input prioritization is a new technique used by JavaScript that takes advantage of a new scheduler for events that can be input and handled almost instantly.

Windows Insiders have already offered their feedback, saying that the performance improvement of Microsoft Edge is nonstop one due to the new ability to scroll and click immediately. You don’t have to wait for a JavaScript heavy page to finish its loading process in this way.

Starting with EdgeHTML 15, Microsoft Edge prioritizes the click event ahead of other work, so the next page you want to see will load almost instantly.

The user receives priority

Input events receive higher priority than any other operations on a web page and the user becomes the browser’s priority. Whatever work a website is trying to complete is less important than what the user desires to accomplish. So, even if a page will be very busy running JavaScript timer, input from the user’s keyboard or mouse will be the main priority.

UI becomes more important than web content

Another improvement that comes with the Creators Update is to make another particular queue for input to the browser UI. Microsoft Edge has become more intelligent in handling browser UI input separately from web page input. In the Creators Update, browser UI inputs received a particular priority and allows the user to close a misbehaving tab without having to wait for it to respond. This input in now handled much faster than the in-page user input.

Microsoft Edge users are actually seeing the benefits of the input prioritization and can enjoy greater sessions on heavy websites.

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