There is a chat message that will make users unbearably laggy / crash when rendered in chat window. Players can easily paste it in-game.
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This issue has already been reported, please search for existing bug reports instead of filing new ones.
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As mentioned above, this issue was already reported. Please follow this post for updates on the issue: Users Able To Lag Games Via Chat - Bug Reports / Engine Bugs - Developer Forum | Roblox
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