Macworld Over time, iPhones and iPads tend to slow down as they get clogged up with unwanted files and apps. You can give your device a little speed boost by clearing out the junk and memory-clogging files on your device. In this article, we explain how to clean out the cache, which could get your iPhone or iPad running faster. What is cache?Pronounced ‘cash’, this is an area of memory on your device where small, temporary files are kept. These are often useful and speed up performance by allowing the CPU to access regularly used files quickly. The most common use is on websites where the cach…