Should I just keep my cron to run rssposter and do it for each minute and keep the limit to 1?
I think that should work.
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What would happen if the previous feed is taking more than 1 minute to retrieve, should it cause an error?
I'm not sure, but I think it should work. But if you have one feed taking longer than 1 minute it might time out because there's usually a time limit set for how long a php script can run. If that happens I suppose you could limit the number of items for that feed. If you have one feed that continually has so many items that it takes more than 1 minute to run every time, then I'm not sure what you could do, you might need to figure out a way to rewrite rssposter.php.
I did a diff of the vb3 and vb4 rssposter.php and there are only minor differences, so I wouldn't worry about that issue.