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You might run into a message like this one. On Windows and Mac OS-X it might look a little different, but the message is the same: a script, in this case JQuery, takes longer than normal and that's why this message pops up.
Your browser may indicate that the JQuery script is "Unresponsive". This is not the case, but it needs more time to render the report.
You get the options to to "Stop script" and "Continue". You can freely choose either option: stop or continue. Nothing goes wrong and certainly not with your photos, because this concerns your browser and not Lightroom.