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Page up and page down does not work in the manual and lore mages, scroll wheel rotates too slowly, dragging the scroll bar is jittery and does not work reliably.

Overall, the GUI is not great, especially considering PC stadards of today.
Are you referring to scrolling in the manual and lore pages (which are handled differently) or other places?

https://sixages.com/manual/desktop/Manual-StormAge.html might be a more convenient way to access the manual.