“Still, the version of iTunes that ships with Lion supports 64-bit processing for the first time. We also wonder about any performance impact from Lion’s new auto-versioning feature,” Brown reports. “There’s also the question of how well third-party programs will make the transition in these early days, since they might still be awaiting optimization.”
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Brown reports, “it seems that iTunes does indeed benefit from the shift to 64-bit support. For Photoshop CS5, which does not yet support Lion’s versioning capability, the performance dip could come from background code tied to versioning, or perhaps it’s simply an optimization issue.”
Read more in the full article, which includes the benchmark results, here.