While much of the recent discussion about the new iPhone 5s and 5c has been about colors and availability, the Macworld Lab has been busy thinking about the new iPhones' performance. We put our brand new iPhone 5s and 5c to the test and found that the devices to live up to--and in some cases surpass--Apple's marketing claims.While many things about the new iPhones are similar to last year's iPhone 5 (including the 4-inch screen, 1136 by 640 pixel resolution, and storage capacity), there are a number of under-the-hood changes that range from subtle to startling.The iPhone 5s features a brand new 64-bit A7 processor running at 1.3GHz. The iPhone 5c is powered by Apple's A6 processor that was introduced in last year's iPhone 5. Apple says the new A7 chip is up to twice as fast as the A6 in both processing and graphics. Interestingly, most of tests we ran show the iPhone 5s to be twice as fast as the iPhone 5c, but the 5c proved to be a bit slower than last year's iPhone 5 with the same 1.3GHz A6
