All Macs In-Depth Tests
Performance Comparison Between a Fragmented and Unfragmented Disk

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The graphs below represent a performance comparison between a badly fragmented disk and the same disk optimized. It appears that unfragmenting and optimizing the disk improves performance by about 10 percent. Test were performed on a Performa 6300. Testing was done using MacBench 3.0. MacBench profiles popular software programs such as Adobe Photoshop, Word 6.0 and QuarkXpress among a variety of others and applies these profiles to the various subsystems being tested. See this description of what MacBench tests and how. Longer bars equals faster performance.

Fragmentation  Comparison Graph