At a media event on October 14, Apple announced a top-to-bottom refresh of its portable Macs. Along with new unibody MacBooks and MacBook Pros, the company also unveiled an updated MacBook Air that featured faster graphics and more storage.

The new US$2,499 top-of-the-line MacBook Air has arrived in the Macworld Lab, and our test results show that while the many under-the-hood improvements have helped to make Apple's ultraportable more competitive in terms of performance, it's still a product that you buy for its small size and light weight, not its speed.

The configuration we tested definitely offers better specs than the previous top-of-the-line MacBook Air. It's powered by a standard 1.86GHz Intel Core 2 Duo processor with 6MB of L2 cache, as opposed to the custom-built 1.8GHz Intel Core 2 Duo with 4MB of L2 cache used on the original high-end MacBook Air. The speed of the front-size bus has increased to 1066MHz, and the new MacBook Air models use faster DDR3 RAM as opposed to the slower DDR2 RAM found in the original Airs. In terms of storage, the new high-end Air uses a solid-state 128GB hard drive, twice the size of the SSD found in the original Air.

Both of the new MacBook Air models eschew the original Air's pokey Intel GMA X3100 integrated graphics for the much more powerful, though still integrated, Nvidia GeForce 9400M graphics system--the same graphics used in the new unibody MacBook Pro and MacBook models, albeit running at lower speeds in order to save power and reduce heat.

How do these internal updates translate in terms of real performance? It should come as no surprise that our overall system performance benchmark, Speedmark 5, found the 1.86GHz MacBook Air to be quite a bit faster across the board than the standard 1.6GHz MacBook Air from January of this year. The 1.86GHz Air turned in a 51 percent higher Speedmark score, with the most impressive individual results being the Quake 4 frames per second score and the Zip Archive test, which took nearly 10 minutes on the older Air and a less painful 6 minutes on the 1.86Ghz MacBook Air.

More telling were the new system's results compared to our build-to-order Air from earlier this year, the model that featured the optional 1.8GHz Core 2 Duo processor, but kept the standard 120GB Parallel ATA hard drive. The new high-end Air posted a 39 percent higher Speedmark 5 score than that old CTO Air. It was also 28 percent faster in our Photoshop tests and 22 percent faster in our Cinema 4D testing. Compressor, iMovie and iTunes were faster on the new system, but not by as big of a margin. Again, the biggest gains for the new Air were in our game frame rate tests. The new Air was able to display 24.8 frames per second in our Quake 4 tests, as opposed to the older CTO Air's 3.9 fps - that's more than a 6x improvement.

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