Entertaining opinion piece <http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=11935838>: To make their apps run faster, some designers make them store copies of things in RAM ... Known as cacheing, this makes things work much faster - until your system starts to run out of memory. For cacheing to be effective, the amount of space devoted to it must be carefully managed by the application and the device's operating system. Some app developers don't put the effort that they should into doing this well, and their applications not only slow down over time, but can drag the rest of the system down with them too. So trying to speed things up can make things slower??