Re: Lyx sluggish on Windows 10

[Jean-Marc Lasgouttes]

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