SUMMARY While scrolling pages in Chromium, there is occasional lag. However, when the Plasma FPS widget is enabled, scrolling becomes smoother. I suspect this might be related to GPU frequency. I've seen a similar bug report where this behavior was observed, but it affected the smoothness of the entire Plasma environment. STEPS TO REPRODUCE 1. Start plasma wayland session 2. Open chromium 3. Scroll pages OBSERVED RESULT Smooth scrolling EXPECTED RESULT A little lagging occurs SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.27.7 KDE Frameworks Version: 5.109.0 Qt Version: 5.15.10 Kernel Version: 6.4.10-zen1-1-zen (64-bit) Graphics Platform: Wayland Processors: 16 × 11th Gen Intel® Core™ i7-11700 @ 2.50GHz Memory: 31.2 GiB of RAM Graphics Processor: AMD Radeon RX 6800 XT Manufacturer: ASUS
https://invent.kde.org/plasma/kwin/-/issues/124
I can assure you that your GPU can handle a scrolling website just fine, no matter the frequency it's running on. Please report this to Chromium developers
I know that my GPU is pretty enough to scroll web pages. However, when deciding where to report this issue, I have two reasons to choose reporting it here: 1. FPS plasma widget is fixes situation 2. Other wayland compositor isn't affected(I have tested only on weston yet, will test mutter soon) So I decided that it's can be somehow related to the specific compositor. Also I should note that it works much better under xwayland and ideal smooth on X11(with KDE)
Your reasoning is sound, but a bug being specific to Chromium running on KWin doesn't mean that it's caused by KWin. This is most likely caused by the same problem as https://bugs.chromium.org/p/chromium/issues/detail?id=1310539, which is that Chromium doesn't properly work with frame callbacks
I've reported it to the chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=1475505
The Presentation Time Protocol has fixed this issue