Data stored in cloud takes forever to load
Photographs that have been uploaded to iCloud can take anything up to ten minutes to download to an iOS device, but that's not the worst of it. Emails that contain nothing but words - no photographs, no attachments of any kind - can take 10 minutes or more to download, and sometimes don't download at all. I've just given up on an email containing nothing but text that was still downloading after nearly half an hour. My wifi connection is otherwise reasonably fast. Is this the normal situation with the cloud, and if it is, can anyone explain to me why I should continue using it? If it's not normal can anyone suggest measures I can take to solve the problem?
iPad Air, iOS 9.1