WebRender, also known as Quantum Render, is a GPU-based renderer for the web which promises performance increase for the given components, built using the programming language, Rust.
Mozilla has been tinkering with the new web technology, and has finally began the rollout to select Firefox users, running version 67 of the browser, which feature was supposed to launch with Firefox Quantum, but the WebRender technology wasn't ready at the time.
While Firefox Quantum brought many performance improvements, including the Servo super fast CSS engine, albeit the big piece of Servo technology, WebRender was omitted in Firefox Quantum, with Mozilla promising that it is coming soon, which is now being added to Firefox as part of Quantum Render project.
According to Lin Clark, a programmer at Mozilla, WebRender runs at a silky smooth 60 frames per second (FPS) or better no matter how big the display is or how much of the page is changing from frame to frame, and pages that chug along at 15 FPS in Chrome or today’s Firefox run at 60 FPS with WebRender.
Firefox 67 beta release notes has it that the WebRender feature is only been tested for desktops equipped with an NVIDIA GPU, and running on Windows 10, but it's not clear whether the feature will be coming to other platforms or even to older versions of Windows.