[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 postix changed: What|Removed |Added CC||pos...@posteo.eu -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Nikola Kocic changed: What|Removed |Added CC||nikolakoci...@gmail.com -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #12 from Yiyang Wu --- Confirm that this issue still exists on my Debian 12 Plasma-5.27 laptop. Is there any progress these days? -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Yiyang Wu changed: What|Removed |Added CC||xgreenlandfor...@gmail.com -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #11 from Oliver Sander --- > Why is devicePixelRatio here forced to be 1...? That part of the code was reworked in a recent merge request. Maybe it'll help you: https://invent.kde.org/graphics/okular/-/merge_requests/371 -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #10 from Filzmaier Josef --- Created a MR: https://invent.kde.org/graphics/okular/-/merge_requests/458 -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Albert Astals Cid changed: What|Removed |Added CC||aa...@kde.org --- Comment #9 from Albert Astals Cid --- Those kWarnings need to be changed to qWarning -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #8 from Filzmaier Josef --- I couldn't yet find a solution to the probelm, a few questions though: https://invent.kde.org/graphics/okular/-/blob/master/core/document.cpp#L1519 Why is devicePixelRatio here forced to be 1 instead of QScreen::devicePixelRatio()? If enabling PAGEVIEW_DEBUG=true the build fails because kWarning does not exist on my machine. If this is a bug i could create a merge request that fixes this. Is there a way to tell an application to use the scale of 225%, as configured within the "Display and Monitor" KCM? QT_SCALE_FACTOR does not seem to have the same effect. When starting Okular it reports in the 225% Display Scale case: org.kde.okular.core: sending request observer=0x560658c0b5d0 3582x5001@1 async == true isTile == false When starting in 100% Display Scale case: org.kde.okular.core: sending request observer=0x5585941d7490 2688x3751@2 async == true isTile == false My suspicion is that the difference in requestRect size causes a problem here. I'm still investigating how this size comes to be On another note: Typing in values in the "Display and Monitor" KCM's "Scale" Spinner directly is a really weird experience -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #7 from Filzmaier Josef --- @Oliver Sander I can confirm that the problem is related to display scaling. If i change the display scale to 100% the performance is as expected, even if the resolution is at 4k and the cpu_governor is set to "powersave". Today i have some spare time, so i will now try to debug this issue and report my findings -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Oliver Sander changed: What|Removed |Added CC||oliver.san...@tu-dresden.de --- Comment #6 from Oliver Sander --- Do you also see the problem without scaling? Screen scaling works differently under Wayland, and you may[0] end up with an 8K temporary bitmap. That is simply a lot of data, and maybe the lagging is for that? [0] I am not 100% about this, but it is worth checking. -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 David Hurka changed: What|Removed |Added Version|unspecified |21.04.3 Component|PDF backend |general --- Comment #5 from David Hurka --- Thanks. The most relevant source is probably part/pageview.cpp and part/pagepainter.cpp. PageView::paint() might (indirectly) tell Wayland wrong stuff so it does more than necessary. PagePainter paints the document (this is usually the only painting done in PageView::paint()), and has a fast and a slow code path. Maybe the fast path doesn’t work on your system. The repository is at https://invent.kde.org/graphics/okular. -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #4 from Filzmaier Josef --- It does not seem to be dependent on the file format / generator. I have tested with pdf, txt and epub, and tiff - all have laggy scrolling. I am using Okular 21.04.3 but can also reproduce it with the current master branch. I have built okular from source, if you can point me at interesting source files to debug i am glad to help. The Effect is especially extreme if i unplug the device (e.g. when TLP enables some power saving features like power_save cpu_governor etc) so it does seem like a performance regression -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #3 from David Hurka --- Does it happen only with PDF? Or only if there is e. g. a stamp annotation? Or do you use the Change Colors feature? Have some text selections active? Which Okular version do you use? Simone reported this for 19.04.2, but there was a recent change related to screen scaling, which possibly affects performance. -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Nate Graham changed: What|Removed |Added Ever confirmed|0 |1 Status|REPORTED|CONFIRMED --- Comment #2 from Nate Graham --- Can reproduce. -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 --- Comment #1 from Filzmaier Josef --- I can reproduce this issue on my lenovo thinkpad x1 carbon gen9. I do have a 4k screen and scrolling pages within this document is almost unusably slow. Opening the PDF in Firefox (wayland enabled) has way better performance. This Problem is *not* dependent on a secondary screen being plugged in (at least in my case) Operating System: Arch Linux KDE Plasma Version: 5.22.3 KDE Frameworks Version: 5.83.0 Qt Version: 5.15.2 Kernel Version: 5.12.15-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 8 × 11th Gen Intel® Core™ i7-1185G7 @ 3.00GHz Memory: 31,1 GiB of RAM Graphics Processor: Mesa Intel® Xe Graphics -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Filzmaier Josef changed: What|Removed |Added CC||j.filzma...@gmx.at -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Nate Graham changed: What|Removed |Added CC||n...@kde.org -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Simone changed: What|Removed |Added See Also||https://bugs.kde.org/show_b ||ug.cgi?id=387567 -- You are receiving this mail because: You are the assignee for the bug.
[okular] [Bug 409644] [Wayland] Panning in Okular is laggy with 4K monitor
https://bugs.kde.org/show_bug.cgi?id=409644 Simone changed: What|Removed |Added Summary|[Wayland] Panning is laggy |[Wayland] Panning in Okular ||is laggy with 4K monitor -- You are receiving this mail because: You are the assignee for the bug.
