I started to notice in the post preview that mentions are being parsed over and over again. We used to have a cache for it such that mentions that have already been found will be ignored.
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I’ll have a look. I might know what it is 
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I noticed this as well. Thought it was just my computer!
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Here’s a fix for this:
https://github.com/discourse/discourse/commit/e07dfe16d72d89f0314025c3cc6e2c266d61de4f
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