Created attachment 128936 [details] demonstration of the problem Scrolling via page up/down is extremely slow in 1.10.1. Downgrading to 1.10.0 fixes the issue. STEPS TO REPRODUCE 1. Open any PDF 2. Hold page down OBSERVED RESULT The document scrolls slower than when you hold cursor up/down. EXPECTED RESULT The document scrolls very quickly. Like in 1.10.0. SOFTWARE/OS VERSIONS Arch Linux ADDITIONAL INFORMATION In the attached video I first hold cursor down to scroll downwards. Then I hold page up to scroll upwards.
Reverting 08d368c13b0fa7368be9720b8de1b7a67188b8e9 fixes the issue. cc https://bugs.kde.org/show_bug.cgi?id=420492
Whenever you fix one thing, another thing breaks :'(
AFAIK this has been fixed by allowing repeated scroll events.