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Frax is currently a 32-bit app, Weiss said, and it runs 50 percent faster on the A7-powered iPhone 5S compared with the A6-powered iPhone 5. And then came the second speed boost: When he compiled the first 64-bit version, Frax ran 25 percent faster than the 32-bit version on the iPhone 5S. Together, that means the 64-bit app runs nearly 90 percent faster on an iPhone 5S than the 32-bit version on the iPhone 5. "We'll have this ready in a dot release soon," so iPhone 5S customers can take advantage of the 64-bit version, Weiss told CNET. And he expects further performance gains from software optimization.

Other developers probably shouldn't expect the same speedup, though, Calculating fractal imagery, while taxing for a processor, also happens to be the sort of work iphone screen protector melbourne that it can do very predictably and efficiently without a lot of the fits and starts common in mainstream software, said David Kanter, principal analyst at Real World Tech, "Fractalization is the nicest kind of workload," Kanter said, "Whatever speedup they're seeing is probably the best case."Apple wasn't clear what speed tests it was using and how universal their results were when announcing the better A7 performance, But one thing is sure: Benchmarks are always an imperfect measure of real-world performance, even when there are no shenanigans involved..

Speed tests let people compare software performance on different hardware, operating systems, and configurations. But it's hard to find benchmarks that directly predict how well the tremendous variety of real-world apps will do. Different software stresses different aspects of computing performance -- memory access, graphics operations, running a single sequence of steps, running multiple sequences that can be spread across multiple processor cores, and so on. 64-bit boost? NopeThere are some points of clarity, though. One in Frax's case is that the 64-bit nature of the A7 -- temporarily derided as a gimmick by an executive at rival chipmaker Qualcomm -- doesn't actually help performance today. A prime reason for 64-bit chips is easy support for more than 4GB of memory, and iOS devices aren't yet at that limit, but the 64-bit design brings plenty of other improvements that do help performance.

The Frax boost instead comes chiefly from two changes, Weiss said: the A7's larger number of storage slots, called registers, and the fact that it can perform high-precision calculations faster on numbers stored in floating-point formats, In his words, The second reason is that the 64-bit chip can iphone screen protector melbourne perform two double-precision operations in parallel, whereas previous chips could only perform one at a time, This needs to be specially coded for, but in theory it can result in a doubling of speed., The instructions to do two double-precision operations at once with SIMD [single instruction, multiple data] were added as part of the overall 64-bit design changes, though it's not related to the 64-bitness of the chip per se..

He also said the ARMv8 chip architecture that the A7 uses gives Frax a boost because it can perform a combination of multiplication and addition in one step instead of two. Real World Tech's Kanter points to other advantages that come with the A7 that will help a wider variety of software: better performance when it's time for the chip to retrieve data from a device's main memory or its high-speed cache memory. Specifically, the chip can retrieve data sooner from its level-2 cache -- the first place a processor looks for data -- which means the chip wastes less time idling.