Update 5:
O.k. , I stand corrected (Again),
I see here:
https://www.ads-software.com/extend/plugins/feedwordpress/changelog/
The clear defenition of “time limit on updates”:
LOAD BALANCING AND TIME LIMITING FEATURES FOR UPDATES: Some users have encountered issues due to running up against PHP execution time limits during the process of updating large syndicated feeds, or a very large set of syndicated feeds. FeedWordPress now has a feature that allows you to limit the total amount of time spent updating a feed, through the “Time limit on updates” setting under Syndication –> Options. By turning on this setting and adjusting the time limit to a low enough figure to avoid your PHP installation’s time-out setting. (PHP execution time limits are usually in the vicinity of 30 seconds, so an update time limit of 25 seconds or so should provide plenty of time for updates while allowing a cushion of time for other, non-update-related functions to do their work.)
If feed updates are interrupted by the time limit, FeedWordPress uses some simple load balancing features to make sure that updates to other feeds will not be blocked by the time-hogging feed, and will also make sure that when the interrupted update is resumed, FeedWordPress will skip ahead to resume processing items at the point at which it was interrupted last time, so that posts further down in the feed will eventually get processed, and not get blocked by the amount of time it takes to process the items higher up in the feed.
What I don’t get is that I just used this to update something like 5 feeds (for less then 15 sec), and I got the following memory update:
WordPress peak memory usage: 69.31 MB
Number of database queries: 4429
So even that I used such a low number, still, I get a report of high memory usage.
Now I am completely out of ideas of what to do … ??