Performance and Battery Life:
Nokia Lumia 1320 is powered by Qualcomm Snapdragon 400 chipset. It contains dual-core CPUs clocked at 1.7GHz and an Adreno 305 GPU. The chipset found in the Lumia 1320 is newer than the one in Lumia 1020, or any of the Lumia phones released last year. Performance wise though the Snapdragon 400 is neck to neck with Snapdragon S4 Pro. It also has 1GB RAM, so app compatibility will not be a problem. As a whole, the Lumia 1320 performs exactly the same as any Windows Phone flagship, with the exception of Lumia 1520.
Because of the size of the phone, Nokia was able to fit in a very large 3400 mAh battery. Under moderate use, you should get well over 24 hours of usage. However Windows Phone has a bad habit of letting apps consume too many CPU cycles, which results in rapid battery drain; 3400 mAh or not. These issues will most probably be resolved in Windows Phone 8.1. For now though if you don’t install any rogue apps, the battery should not trouble you.
Browser performance is similar to any Windows Phone, that is, it gets the job done. The large screen definitely makes it a lot easier to view complex webpages.