I'm not finding any information about my problem on the web, not has it been fixed by any common solutions (reinstalling pages, restoring my iPad, resetting settings). Basically, if I'm editing a document in pages, then switch to another app, when I return to pages, the keyboard is lagging so badly that it becomes unusable. Only shutting down Pages entirely seems to fix the problem. This issue seems to have emerged with the latest system update (9.2.1). I'm running Pages version 2.6.1 on a 4th generation iPad.