Apple has just released desktop Safari for Mac and Windows to 4.0.4, which improves full history search performance, has the mandatory stability improvements, and security fixes, but the big news as far as we’re concerned is the number one item on the list — Improved JavaScript performance

Desktop Safari is the big brother of the iPhone’s Mobile OS X Safari, and they share a rendering engine (WebKit), and a JavaScript engine (Nitro), and improvements in desktop Safari and Nitro have traditionally filtered down to Mobile Safari with the subsequent iPhone OS update. That’s right, we’re looking at you iPhone 3.2 (where ever you are!)

Since the current iPhone 3.1 Safari is still outperforming even brand-new devices like the Droid, that may seem a little greedy, but we know Google’s Android and Palm’s webOS aren’t sitting still in the rendering race, and have updates of their own in the pipeline, so once again, competition benefits the end users. Bring. It..

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Apple Updates Mac/Windows Safari to 4.0.4 — Raises Stakes in JavaScript Wars

We mentioned yesterday that iPhone OS 3.0’s Mobile Safari Browser was being reported as faster than the current iPhone OS 2.2.1 version. Now Ars Technica has run the numbers and the results are pretty impressive. Check out their full report for all the details, but this sums it up nicely:

According to our sources, the 3.0 beta still has some stability and speed issues, so that makes these results that much more impressive. While the overall average gives the iPhone 3.0 beta a 300 percent speed advantage, some of the individual tests show 6x, 8x, or even 11x improvements—the bitwise “AND” function even runs 16x faster than in the current version of Mobile Safari.

Should make the release version of the new, Nitro-powered Mobile Safari 3.0 fairly impressive, come summer! Bring on them multi-app Facebook pages, the iPhone will be ready! (Joking… a bit.)

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iPhone OS 3.0: Ars Benchmarks Mobile Safari — 3x – 16x Faster than 2.2

We so fondly remember Palm’s Roger McNamee stating the Pre would be a million times faster on the web than the iPhone (now retracted), and even our sister-site PreCentral.net jumped on that band wagon, saying the Pre looked to be 4x faster than the iPhone.

Of course, we mentioned that on Sprint, lacking simultaneous voice and data, even a million times zero is still zero. Less flippantly, however, when Safari 4 Beta shipped for the desktop with its new ultra-fast Nitro (formerly SquirrelFish) rendering engine, we figured it would only be a matter of time before that scaled down to the iPhone’s version of Safari (based on the same WebKit foundations as desktop Safari, as is the Palm Pre browser and Android Chrome Lite).

Now Daring Fireball and Wayne Pan posit that turbo boost might have already happened in iPhone OS 3.0:

Wayne Pan has braved the NDA waters and published JavaScript benchmarks for iPhone OS 3.0, and they are impressive — with results ranging between 3× and 10× faster than iPhone OS 2.2. And I’ll confirm that MobileSafari on iPhone OS 3.0 passes my simple “could be Nitro” recursion depth test.

From what we’ve seen of 3.0, it seems that way to us as well. Along with HTML5, CSS, 2D and 3D animation, anti-phishing, AutoFill, etc., it will be interesting to see what Apple and the WebKit team can pull of by the time iPhone 3.0 launches this summer…

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iPhone 3.0: Mobile Safari Using Nitro Engine for Ultra-Fast Web Browsing?