By Joone Hur, Outlook team, Patrick Brosset
Publication Date: 2025-12-09 16:57:00
On the web, speed is everything. The responsiveness of your browser, the time it takes for a web app to appear, and how quickly that app handles user interactions all directly impact your experience as a web user.
At Microsoft, we care deeply about improving web performance, and we’re making progress on it from several directions:
Based on our own experience, we know that complex applications require complex architectures that sometimes rely on multiple windows, iframes, or worker threads. To deal with the slowdowns that these multiple parallel contexts can introduce, we’re proposing a new feature for web developers: the Delayed Message Timing API.
If you’re a web developer, continue reading to learn more about the Delayed Message Timing API proposal, and let us know if it might help you make your own web app faster, or share ways in which the API could be better.
What causes delays in cross-context messaging?
Delays can occur when an app exchanges a lot of messages between…
