I own one. I'm surprised you haven't noticed the lag when trying javascript intense sites (like games). Here are the iPad Nitro Sunspider results: 2121ms vs. Chrome 11: 248ms. That would make Mobile Safari javascript 8x slower than desktop Chrome (other desktop browsers have similar speeds).

[1] http://www.electronista.com/articles/11/03/03/ipad.2.4x.fast... [2] http://ie.microsoft.com/testdrive/benchmarks/sunspider/Table...