Earlier this week, Google released Crankshaft, a new compilation infrastructure for V8, Chrome's JavaScript engine.
Crankshaft improves the performance of JavaScript applications and should give Chrome users a better experience when loading web pages and JavaScript applications.
Crankshaft's four main components include a base complier, a runtime profiler, an optimizing compiler, and deoptimization support. V8 with Crankshaft for the 32-bit Intel architecture is available now and work on ARM and 64-bit ports are underway.
More information on can be found on the Chromium Blog.