Today we are announcing a new version of the JetStream JavaScript benchmark suite, JetStream 2.

JSC 💕 ES6

Update: The previous version of this post showed performance data from ARES-6 version 1.0.

JavaScriptCore has a new sampling profiler that powers Web Inspector’s JavaScript & Events timeline.

In Safari 9 for OS X and iOS 9 you’ll be able to use some great ES6 features — there are even more you can try out if you run the nightly build.

JavaScript Type and Code Coverage Profiling

Web Inspector now has two great tools designed to make debugging JavaScript programs easier: the Code Coverage Profiler and the Type Profiler.