On Oct 11, 2013, at 2:28 AM, Jerry <lancebo...@qwest.net> wrote: > > 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
Surely this is a Qt problem since there are many Qt programs that don't have this issue. In fact, there are text-related windows in OS X LyX that don't have this problem. (Written by a casual bystander, of course.) Jerry > >> >> There is a branch that tackles this problem, but it is not ready yet. >> >> JMarc >
