A tech site Ars Technica tested JavaScript performance on an iPhone 4 running iOS 4 and a Nexus One running Android 2.2. The results: Android 2.2 (Froyo) smokes iOS 4 when it comes to JavaScript, clocking in two to three times faster than iOS 4's mobile Safari.

Well, the Nexus One has to beat the iPhone. Nexus one is faster (1GHz CPU, vs. 600MHz for 3Gs, and 600-800 for iPhone 4), and these tests are basically CPU performance tests.

Source: Gizmodo