Created attachment 189252 [details] latency comparison video SUMMARY Krita 6 has a significantly higher latency by default for me compared to Krita 5. My primary monitor is 144Hz, my others are 60Hz. When krita is on a 60hz monitor it's very sluggish, but on the 144Hz monitor it's fine. Using the vblank_mode=0 env variable alleviates the lagginess on the 60hz monitors. Changing my primary monitor's refresh rate down to 60hz also seems to fix it instantly, even while Krita is running. (see attachment for a video taken on my 60hz monitor, showing the panning latency before and after adjusting the other monitor's refresh rate) Happens both with and without Canvas Graphics Acceleration checked. STEPS TO REPRODUCE 1. Have too multiple monitors with different refresh rates 2. Run krita 6.0 on one of the lower hz ones 3. I assume wayland is also important? OBSERVED RESULT program repainting seems very slow and lags far behind EXPECTED RESULT no laggier than krita 5 in the same scenario SOFTWARE/OS VERSIONS $ kinfo Operating System: Kubuntu 25.10 KDE Plasma Version: 6.4.5 KDE Frameworks Version: 6.17.0 Qt Version: 6.9.2 Kernel Version: 6.17.0-8-generic (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ i7-6700 CPU @ 3.40GHz Memory: 32 GiB of RAM (31.3 GiB usable) Graphics Processor: AMD Radeon RX 6600 ADDITIONAL INFORMATION