LeagueClientUxRender.exe throttling CPU, even in-game

Is there a reason for this process to hog 20% of my cpu? I know this is the main client task, but it wasn't like this a few patches ago. https://i.imgur.com/t57XRZD.png
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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