On Monday, January 02, 2012 10:12:47 PM Jerry wrote: > I'm evaluating LyX for a major project and am mightily impressed. > > However, there is one problem that stands out: Scrolling the main > LyX window is excruciatingly slow. I'm using LyX 2.0.2 and OS X > 10.6.8. It doesn't seem to matter how I scroll--two-finger swipe > on MacBook Pro trackpad or using the thumb bar or clicking on the > normal scrolling arrows. When scrolling rather fast or using the > two-finger "ballistic scrolling", there are large jumps between > screen updates; sometimes the jump is more than an entire > screenful so there is little hope of reliably spotting things as > they go by. While scrolling, processor usage goes to 100% > > The problem seems to be (just guessing here) that text rendering is > slowing things down, as if screen drawing is not being buffered. > If I make the window narrower, things seem to improve a little, > also if there is a part of the document that has less text because > of graphics or white space. Also, making the text larger seems to > help--again, pointing to problems rendering text > > Enabling "pixmap cache" helps a little but it makes the on-screen > fonts hard to read because it does away with sub-pixel > antialiasing, which I hate. > > I'm actually kind of distressed about this because of the prospect > of spending months writing in LyX, and I'm surprised that this > problem exists as prominently as it does. > > Is there a work-around? I've tried a few different fonts but that > doesn't seem to help.
Hi Jerry, I also see the symptom you describe on a 110K word book in LyX, rendered in LyX 2.0.0 on Ubuntu Linux 11.04 on a 3 year old desktop with an Intel dual core. If I scroll by dragging the vertical scrollbar, it goes in jumps. If I use my mouse wheel, it seems a little slow there too. PageDown is not without its delays. I've never noticed this problem before, even though I've written almost ten books in LyX. The reason I never noticed it is I seldom have a reason to scroll through significant parts of the book. If I'm looking for something, I can either find it drilling down via outline view, or use text search to find it. The only time I scroll is when I expect the needed text to be within a couple pagefulls of where I am now. Also, Ctrl+Home and Ctrl+End can be used to go to the Beginning/End of the document, in less than 1/4 second. You can also set and goto up to 9 bookmarks with hotkeys. Bottom line, I reproduced the symptom you mentioned, but other LyX features make it not the slightest bit of a problem. SteveT Steve Litt Author: The Key to Everyday Excellence http://www.troubleshooters.com/bookstore/key_excellence.htm Twitter: http://www.twitter.com/stevelitt
