I read this comment on one of the threads on reddit: > It broke because of /r/politics. When a discussion thread gets meaningfully past 30,000 comments, it sta

I read this comment on one of the threads on reddit: > It broke because of /r/politics. When a discussion thread gets meaningfully past 30,000 comments, it starts to lag subsequent submissions to that thread, and then lag the entire site, until there's eventually a full chokeoff. The debate thread ballooned to an insane number of 56k before mods locked it, at which point the comments in there were 25 minutes behind realtime. > Had the /r/politics mods locked the first thread and started a new one properly, it wouldn't have caused a sitewide issue. But this has been a problem since forever. It just rarely happens because there are rarely scenarios where enough people are commenting on a single specific thread so as to cause the cascade failure.