LoL forums, why do they lock up constantly?

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So I've noticed a really annoying issue over the last week or so. It appears that if you are reading a thread, or posting a reply the forums will lock up completely (including hyperlinks and buttons) if anyone else posts before you finish.

I've tested this dozens of times, and it is pretty consistent. Is this an issue with Google Chrome browsers, Windows 7 OS, or is it due to some recent change in the forum coding?