Korean text rendering

[Igor Mironchik]

On 15.05.2025 08:49, Konstantin Kharlamov wrote:
> 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?

I guess too this is system specific. I'm on openSUSE Tumbleweed. 
Changing editor's font to Droid Sans doesn't help.

Ok. I see that this issue is system specific, so my question is 
answered. Maybe somebody can check this issue on Tumbleweed only?

Thank you.