Created attachment 155544 [details] restaurant menu SUMMARY I've attached a 2.5MB 7 "page" restaurant menu. It looks like it's just one long image rather than properly encoded. Scrolling through this menu using the pager in the sidebar, there are 5-6 second pauses where the page that is scrolled to just displays as a white screen before it renders (on an 8 core i7). There appears to be no caching of previously rendered content (despite 32GB of ram being available) so scrolling up a previous page has the same issue, even if it was rendered just 30 seconds before. This seems to happen less when the app isn't full screened, so there may be some upscaling happening that slows it down. STEPS TO REPRODUCE 1. Open attached document 2. Scroll using the sidebar (you may need to scroll up and down fast to trigger it) 3. OBSERVED RESULT White screen for extensive period while rendering happens EXPECTED RESULT No delay in rendering SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Ubuntu 22.10 Operating System: Kubuntu 22.10 KDE Plasma Version: 5.25.5 KDE Frameworks Version: 5.98.0 Qt Version: 5.15.6 Kernel Version: 5.19.0-29-generic (64-bit) Graphics Platform: X11 Processors: 8 × Intel® Core™ i7-6700K CPU @ 4.00GHz Memory: 30.8 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 530 Manufacturer: MSI Product Name: MS-7978 System Version: 1.0
I can confirm the multi-second pauses, even with the recent efficiency improvements in PagePainter. The document is indeed a single page, with custom size 452 x 2529 m. It contains a single image with 2312 x 12943 pixels. Okular apparently renders only the visible parts, and that seems to take a while.