Bug 499458

Summary:	Screen motion is laggy when scrolling really fast
Product:	[Applications] okular	Reporter:	jpotapski
Component:	PDF backend	Assignee:	Okular developers <okular-devel>
Status:	REPORTED ---
Severity:	normal
Priority:	NOR
Version First Reported In:	23.08.1
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description jpotapski 2025-02-03 12:05:17 UTC

SUMMARY
When scrolling really fast in Okular PDF view, the screen moves much slower than it should.


STEPS TO REPRODUCE
1. Have a mouse with a free floating scroll wheel (Logitech G502).
2. Flick the mouse wheel to scroll a few pages at a time.


OBSERVED RESULT
Screen moves slower than if you were to scroll normally and/or is really laggy.


EXPECTED RESULT
The screen movement should be directly correlated to the mouse wheel movement.


SOFTWARE/OS VERSIONS
Windows: Windows 11 Pro
Version:	24H2
Installed on:	‎06/‎11/‎2024
OS build:	26100.3037
Experience:	Windows Feature Experience Pack 1000.26100.48.0


ADDITIONAL INFORMATION
Here's a video comparing Okular to Google Chrome's PDF viewer. Both times I'm using the same mouse wheel motion:
https://youtu.be/GRwFyHp-nco