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Would love to have the Unread Post Count addon by Chris integrated into XF core. It'd be nice to have an on/off switch for those who don't want to show the count.
It actually makes little sense to do this as, unfortunately, the performance of the code doesn't scale very well, even with a caching mechanism.
That being said, it seems to be specific to certain set ups. Some people have had zero problems using it and it has been running on some pretty big sites. Some sites have seen it cripple performance with little solution other than to disable it.