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Juha - in pro, click on the comment icon on the far right and the comments window opens up
turning fonts off that you're not using fixes the lag issue
Go to whatever font manager app you use and turn off/disable all the fonts you don't use on a daily basis.
I have a fix for this lag.
After a lot of troubleshooting, I found that it's the number of active fonts on your machine. Once I decreased all active fonts it immediately works with a click.