With Warp (also called WarpBuilder) we’re making big changes to our JIT (just-in-time) compilers, resulting in improved responsiveness, faster page loads and better memory usage. The new architecture is also more maintainable and unlocks additional SpiderMonkey improvements.
Firefox’s latest boost comes from significantly optimizing those JIT compilers, resulting in significant real-world gains over Warp’s predecessor Ion.
Warp is faster than Ion on many workloads. The picture below shows a couple examples: we had a 20% improvement on Google Docs load time, and we are about 10-12% faster on the Speedometer benchmark.
We’ve seen similar page load and responsiveness improvements on other JS-intensive websites such as Reddit and Netflix. Feedback from Nightly users has been positive as well.
Although Firefox is no longer the leading browser, in terms of market share, it continues to be a major player. Its improved performance, not to mention emphasis on privacy, will hopefully help it gain some ground against its larger rivals.