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bbfa235
(Get the code!)
I have a feeling this is something to do with the Nvidia driver. I first noticed this on my desktop PC which was using Mint 20 (based on Ubuntu 20.04), and the "Fresh" PPA of Libreoffice 7.3. I recently moved to Mint 21, based on Ubuntu 22.04. Mindful of this lagging issue in the font selection box, I tested the Mint 21 live USB, which comes with Libreoffice 21. There was no lag when booting from the USB; the font selection box scrolled normally. However, once Mint 21 was installed, and the Nvidia driver was installed from Driver Manager and used instead of Nouveau, then sure enough the font selection box started lagging again.
I also experience no lagging on Mint 21 on my laptop, which is using the built-in Intel graphics chip. So I think this is some sort of rendering issue caused by Nvidia. Try it yourself; try booting into a Live USB of Ubuntu 22.04, make sure the graphics driver is still just Nouveau, and you should find the font selection box works normally.