Firefox Nightly flips on new JIT “Warp” code for greater JavaScript performance

Warp aims to improve the Firefox JavaScript performance by reducing the amount of internal type information that is tracked along with other optimizations. Warp can lead to greater responsiveness and faster page load speed. Numbers cited by Warm developers are normally in the 5~15% range.

As of yesterday, Firefox Nightly now enables Warp by default. The enabling in Firefox Nightly is seeing 20% faster load times for Win64 Google Docs, 13% faster for the Android Reddit SpeedIndex, 18% faster for PDFPaint, and other measurable improvements elsewhere.

That's a big improvement, and sadly, due to the state of the modern web, a very, very welcome one.