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@lxo I didn't like nnrss when i tried it two years ago, and I don't remember exactly why. Looking at my notes it seems to be a combination of

1. polling all RSS feeds blocks (emacs or gnus) startup
2. setting nnrss-use-local to fix the first problem caused some feeds to be missing
3. Refreshing mail with g becoming slow, it's bad idea for a less important thing (RSS) to affect a more important one (mail)
4. it seems to be contacting random feed servers too often