I took a quick look at CoordBranch and it seems to work well. I found
a few bugs that happen to be in HEAD too, but seems to be related to
what you are doing.

- load Tutorial; Ctrl-End ==> crash

  Assertion triggered in Point::Point(int, int) by failing check "y < 4000" in 
file ../../lyx-devel/src/coordcache.h:29
  Aborted

- load Tutorial; scroll with the scroll wheel until you find an
  editable inset like footnote or xref; click on it ==> the display is
  reset to where the cursor was.

- Selecting with the mouse is (still) very very slow; I suspect though
  that your work has nothing to do with that.

JMarc

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