battlepanic described the problem perfectly in the Arch Linux forums. https://bbs.archlinux.org/viewtopic.php?pid=1239765#p1239765 I'll simply copy+paste and confirm his account here: "After upgrading mupdf from version 1.1 to 1.2, I have noticed that scrolling and panning across a document using the mouse is significantly slower. It sometimes takes upwards of 10 seconds for the document to completely scroll to the desired position. Interestingly, the issue is worse if I click and drag the mouse at a slower speed. "Resizing the mupdf window suffers from a similar lag. It takes much longer for the document to be recentered in the window as compared to version 1.1. "Keyboard scrolling in mupdf using the hjkl keys appears unaffected." I experience all the same issues exactly.
Created attachment 9491 [details] Removes extra MotionNotify events Please try this patch if mupdf is unable to respond quick enough to motion events.
I see this too (on OpenBSD here). James, your diff works for me.
(In reply to comment #1) > Created attachment 9491 [details] > Removes extra MotionNotify events > > Please try this patch if mupdf is unable to respond quick enough to motion > events. James, I tested your patch posted on 2013-04-05 and in my case, it looks like the patch provides only a partial fix: RESOLVED: Scrolling a panning a across document using the mouse appears to be fixed and now works as it did in mupdf-1.1. UNRESOLVED: When resizing the mupdf window, The document contained therein still takes much longer to be recentered as compared to mupdf-1.1.
Created attachment 9579 [details] Removes extra MotionNotify and ConfigureNotify events Please try this patch if mupdf is unable to respond quick enough to motion events. I have attempted to patch the other part of the problem regarding resizing, but since it does not occur on my system I am unable to test whether my patch is working or not.
(In reply to comment #4) > Created attachment 9579 [details] > Removes extra MotionNotify and ConfigureNotify events > > Please try this patch if mupdf is unable to respond quick enough to motion > events. > > I have attempted to patch the other part of the problem regarding resizing, > but since it does not occur on my system I am unable to test whether my > patch is working or not. After applying the patch, window resizing is is still noticeably worse than mupdf-1.1 but an improvement over mupdf-1.2. It still takes longer for the document to be recentered in the window as compared to mupdf-1.1. When enlarging the window, artifacts briefly appear along the right side and bottom portions of the window.
Fixed in http://git.ghostscript.com/?p=mupdf.git;a=commit;h=a20d6a58ebc6c60ff44f0f385cf399ee6fca55bf