X Rebuilds Its Web App to Load Faster on Slow Connections

X is rebuilding its website with a simpler technical architecture and says the result should load much faster, particularly for people on slow connections. The company is moving signed-in users to the new experience country by country after first deploying it for visitors who are logged out and for search crawlers.

In an engineering account published on 4 November, X said the previous website relied on separate servers for logged-in users, logged-out users and crawlers. The replacement brings those paths together in a single application. This is a significant change to the machinery behind one of the world’s busiest social platforms, though most users will judge it by a much simpler question: does the page actually appear more quickly?

X says its new application uses React and Relay on the front end, with Fastify, Platformatic Watt and Vite among the tools supporting the rebuild. The company has already switched logged-out pages and search crawler traffic to the new system. It is now moving signed-in users in stages, with controls that allow it to route traffic back if a problem appears.

The headline performance claim is striking. In X’s laboratory test on a throttled, slow connection, the time to display the first post on a profile fell from more than 22 seconds to 2.7 seconds. That is a company measurement under specified conditions, not a promise that every user or every page will see the same improvement. Device performance, local networks and the size of the content being loaded still matter.

The distinction is especially important in markets where headline broadband speeds do not always translate into responsive websites. As TechBooky has explained in its look at real-world connection performance in Nigeria, latency, network congestion and the route data takes can change how fast an online service feels. A lighter, better organised website can help, but it cannot erase every weakness in the connection beneath it.

X competes for attention in a market where users can leave a slow page in seconds. Faster profile and post loads could make the service easier to use on mobile networks and older devices, while more consistent delivery may help search engines index public posts. The latter is commercially important for a platform whose conversations often begin outside its own app.

The rebuild is also an example of AI-assisted software development at scale. X says an initial team of five engineers, working with AI coding agents, built the first version in less than six months before the effort expanded. That account describes how the project was developed; it does not by itself prove that AI produced the measured speed gains. Architectural choices and testing remain central to the outcome.

For now, this is a phased rollout rather than an overnight switch for everyone. Users in different countries may therefore see different versions of X’s website while the migration continues. The more meaningful test will come after signed-in traffic has moved broadly, when independent users can see whether the claimed speed improvements hold across everyday feeds, profiles and search on real networks.