Mozilla has collaborated with other major browser developers to unveil Speedometer 3, a benchmark that focuses on measuring online performance. The release is more open and challenging than before, as it aims to drive browser performance improvements. This is the first time a major browser benchmark has been developed through a cross-industry collaboration. Firefox saw real user performance improvements in 2023 as a result of optimizing for Speedometer 3. The collaborative effort between different browser engines has led to core optimizations benefiting users across the board. This marks a significant step towards building performance tests that enhance the overall Web experience.
https://hacks.mozilla.org/2024/03/improving-performance-in-firefox-and-across-the-web-with-speedometer-3/