rss reader - showing RSS feeds on public website, how expensive is that? -

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is expensive (for bandwidth) run, say, 30+ rss feeds? want let users add rss feeds other users can see them too, have no idea how that'll cost me.

it depends on how feeds read, if provide caching mechanisms , on... hard put number on information providing.

just started, i'd estimation, such as:

  bandwidth usage per hour = avg. size per feed entry × items per feed ×                               total number of feeds on site × calls per hour

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