OE and downloading newsgroups

[dmcd]

I have recently signed up to a newsgroup via Outlook Express. The headers seem to come through in one go but any further mail to the headers seem to only download when I click on them individually. This is fine when the ISP server isn't busy but it can take more than a minute for each message to open when it is busy! Is there any way I can make sure that EVERYTHING ie headers and body are downloaded in one go?
thank you