The technology world goes through a repetitive in-out cycle. Processing of data and communications is centralized, then distributed, then centralized again. So we saw central mainframes giving way to PCs that had more local processing power than the largest server – but now they are starting to behave more like dumb terminals of old, with most of the content and intelligence in the cloud. The trouble with the pure cloud model is that it puts huge strain on the network, with the constant to and fro of data between the central resource and the user – and that issue is exacerbated when the network is wireless. Enter caching and increasingly PC-like mobile devices to ease the load – and the…