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When someone uses the tag of Threadcast, a feature pops up (on the labs version) that allows for auto refreshing along with reversing the order of the comments.

Nice, is labs like a beta version?

Right now the labs has the new leocache which is affected the speed which things load and the ability to change some things.

We did a 1500 comment threadcast on Tuesday and it loaded like it had 10 comments.

Yes it was just released on (to us in the public) on tuesday. It is where the devs are adding new features and we can test them to report bugs. As they are cleared, they will be added to the reg UI.