BlackBerry 10 looks like it has some advantages over current smartphones. Check out this video comparison of the BB 10 browser vs the iPhone 5 browser. Both phones had the pages in memory, and both were on 3G. The BlackBerry was running off of a 3G hotspot while the iPhone 5 was using a 3G SIM. It's not exactly an apples to apples comparison but the BlackBerry did perform well.
The BlackBerry is a Dev Alpha B model so it will be interesting to see what the final version of BlackBerry 10 will be like.