On Oct 10, 2013, at 12:17 AM, Jean-Marc Lasgouttes <lasgout...@lyx.org> wrote:
> Le 10/10/13 01:03, Gwen Barnes a écrit : >> Hi folks, >> >> I am using LyX 2.0.6 on Mac 10.8.5. Whenever I try to scroll, for >> instance, with the mouse wheel, or with trackpad gestures, there is >> almost a full second lag before the screen starts to change, and then it >> moves jerkily until it gets to where it's going. Based on some comments >> I found online, I have found that the lag goes away if I make my LyX >> window tiny -- but then the window is not useful to me. >> >> Any ideas what the problem might be, and things I could try to fix it? > > The problem is a weakness in LyX display mechanism: text is drawn several > characters at a time, while metrics (measurement of size) is done > character-per-character. On windows and linux, it is not a problem, but on a > Mac, where fonts use ligatures, it means that the cursor does not appear > where it should. > > To alleviate that, by default mac builds draws the screen char-by-char too. > It works, but it is quite slow... > You can see what the effect is by adding > \force_paint_single_char 0 > in the preferences file. > > Unfortunately, this situation will not improve in version 2.1. This is discouraging news. This is a serious and longstanding problem. Thanks for the update, J-M. Jerry > > There is a branch that tackles this problem, but it is not ready yet. > > JMarc
