https://bugs.documentfoundation.org/show_bug.cgi?id=158963

--- Comment #8 from Adam <[email protected]> ---
Per Buoyjaga's suggestion, I have installed and tested version 26.2.

I did not experience any lag across screens, even after opening multiple
documents on both monitors. 

*However*

Initially, in dark mode, highlighting was not working on either monitor. While
the text would be selected (per test results), it would not be shown as
highlighted. I considered that this might be a fault in color selection for
highlighting in dark mode, and clicked on the Tools drop-down, only for the
drop down to show as all white with no (visible) text.

As this did not match my results from using the drop down menu in dark mode a
few minutes previously, I closed all but my initial test document, and tried
again. This time it behaved as expected. 

But once I opened up a few new documents and spread them across screens again,
neither the lack-of-highlighting nor the white drop down menu issues repeated. 

As this seems to follow the same 'can be trained out' behavior as I described
previous, but minus the lag symptom, I believe this has the same root cause.
The lack of highlighting issue is one I had previously (in primary build) with
documents on two screens, but I had assumed that it was a side effect of the
lag issue. 

There have been no changes to my hardware, and I am still running Windows 10.



(In reply to Buovjaga from comment #7)
> (In reply to Adam from comment #5)
> > At this point in time, I am not getting any lag with or without the
> > spellchecker or skia options. 
> > 
> > However, with skia off, and two documents on the second monitor (and six
> > open in total), the toolbar icons flash on and off in a fast pattern from
> > left to right, but only on the top document of the two on the 2nd monitor.
> > This did not reoccur when I turned skia back on. 
> > 
> > And upon turning skia back on and restarting the program, I got lag again
> > when splitting the documents. 
> > 
> > And repeated. So something 'remembered' being 'trained' out of lagging,
> > until I turned skia off and back on. 
> 
> In the unreleased version 26.2, Skia is the only Windows graphics backend.
> It would be interesting to hear how it works, if you install
> Win-x86_64@tb77-TDF from
> https://dev-builds.libreoffice.org/daily/master/current.html

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