On Jan 3, 2012, at 4:51 PM, Steve Litt wrote: > 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.
Hmmm. I suspect that the problem is worse on my machine because even scrolling small amounts (a few lines or a couple of pages) is so laggy/jumpy that it is easily noticeable/annoying--hard to track features as they go by. Scrolling large distances in a short time pretty much takes place as fast as scrolling a native application; it's just that to get the job done in roughly the same amount of time, there are huge jumps. In an earlier post in this thread I noted that 2.0.1 was much better in this regard (I just tried 2.0.1 a couple hours ago), so at least in part, this is looks like a recent development. Jerry > > 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 >
