Korean text rendering

[Konstantin Kharlamov]

On Thu, 2025-05-15 at 08:37 +0300, Igor Mironchik wrote:
> 
> On 15.05.2025 08:29, Konstantin Kharlamov wrote:
> > On Thu, 2025-05-15 at 06:29 +0300, Igor Mironchik wrote:
> > > Hi.
> > > 
> > > Are any Korean here? I'm curious if they have very bad
> > > performance of
> > > rendering Korean text in any Qt application? Or is this just
> > > because
> > > of
> > > missing some fonts on my system? I see a huge performance
> > > slowdown on
> > > Korean text rendering.
> > How did you measure? I'm not a Korean, but I tried pasting a Korean
> > wiki article to Kate with "Droid Sans [1ASC]" font and scrolling
> > and I
> > don't see any change in performance. Perhaps some more scientific
> > method required.
> 
> 
> I paste in Kate a Korean text (~1kB), it took so much time to paste
> and 
> render it (~5 seconds), and Kate starts to think a lot even on 
> navigating in menu.
> 
> The same with English or Russian text - I don't see any delays, Kate
> is 
> responsive.

I see. Seems something specific to your system — I just created a 158K
text file by copy-pasting a Korean Wiki article a dozen of times, and
when I open it in Kate, everything is smooth and nice.

Is it maybe the font? What font do you use? Can you try going to Kate
settings and changing the font to "Droid Sans [1ASC]" (on Archlnux it's
a `ttf-droid` package) and seeing if that makes any difference?