Le 10/03/2019 à 19:00, Paul A. Rubin a écrit :
    When I type into an equation CPU usage hits about 50%, split
    evenly between Lyx and a process called "Usermode Font Driver
    Host". I googled the latter and found some references to it in
    connection with possibly similar problems
    
(https://forum.affinity.serif.com/index.php?/topic/51268-usermode-font-driver-host-freezes-computer/).
    I tried the "clean boot" mentioned in that discussion but it
    didn't change anything.
Other than that, the only thing I could think of would be some sort of issue with the screen font. You mentioned issues when typing math and scrolling through documents. If the scrolling issues occur only in documents containing math (or other "interesting" glyphs), and not in plain text documents, you might try changing your screen fonts to something "Windows-standard" (if they are not already so) and see if that mitigates the issue.

Indeed, the affinity forum suggest that the problem was a font after all. It would make sense to change the default screen font to something standard if it is not the case already.

If we were able to reproduce, we could try to do something about it, but currently I am a bit dry.

JMarc

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