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I currently manage a multisite installation with 7 member blogs. We need to produce a combined RSS feed of news from all 7. Currently we use Feedwordpress to syndicate 6 blogs into blog number 7. This isn't working out because we're duplicating content in the db.

Ideally I need a cached feed to reduce server load (the feed is subscribed to via high-traffic portals).

What's the best way of doing this? I've considered Yahoo Pipes, but how about using Wordpress transients to cache a query across all member blogs, and somehow publishing this as RSS?

JSON could be an option, but RSS is probably preferred.

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Here's one option we use for a high volume global RSS feed. It's worked out really well for us and has lower load times than trying to do some runtime combination.

http://premium.wpmudev.org/project/post-indexer/ http://premium.wpmudev.org/project/recent-global-posts-feed/

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