Created attachment 195978 [details] Perf flamegraph Run with kf5 or kf6. 1. Open attachment 171031 [details] 2. Click the vertical scrollbar and drag down Not seen with gtk3, gen or Windows. It seems to have gotten worse in 7.5, but quite tricky to bibisect. On the other hand, in older versions, scrolling back up freezes LibreOffice while in current master it does not freeze. Lots on time spent in SwLayoutFrame::PaintSwFrame Michael: any idea about this? Version: 25.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: e1a4cdb3564c38ac1b75cc076c6762369e79137c CPU threads: 8; OS: Linux 6.10; UI render: default; VCL: kf6 (cairo+wayland) Locale: fi-FI (fi_FI.UTF-8); UI: en-US Calc: CL threaded
(In reply to Buovjaga from comment #0) > Lots on time spent in SwLayoutFrame::PaintSwFrame > > Michael: any idea about this? See bug 152911 comment 13 (This is Writer layout code, I'm not very familiar with this. Without investigating further, the most likely explanation seems to be that Qt mouse event handling on Wayland differs from other VCL plugins, but that's likely on the Qt library, not LO level.) *** This bug has been marked as a duplicate of bug 152911 ***