It should improve performance in the sense that Rust helps to produce code which can be easily parallelized.
But Servo being written in Rust isn't the argument that he's making.
Servo is built with a modern architecture, which all current browsers don't have, because they all started out somewhen pre-2000, before multi-core processors were really a thing, and before the web was really graphical.
What Servo can improve is mainly, that the rendering of HTML itself is parallelized in Servo, and that with WebRender, they utilize graphics cards quite similar to the way that videogames do it, which both do result in noticeable performance improvements.
But Servo being written in Rust isn't the argument that he's making.
Servo is built with a modern architecture, which all current browsers don't have, because they all started out somewhen pre-2000, before multi-core processors were really a thing, and before the web was really graphical.
What Servo can improve is mainly, that the rendering of HTML itself is parallelized in Servo, and that with WebRender, they utilize graphics cards quite similar to the way that videogames do it, which both do result in noticeable performance improvements.