I have exactly the same problem when preparing scientific posters and
including scatter plots with thousands of points. This bug is really
awful. It's been four years, it's bizarre that this hasn't been solved

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  Text editing very slow in 0.91 on files with many objects, normal in

Status in Inkscape:
Status in inkscape package in Ubuntu:

Bug description:
  Tested with Inkscape stable 0.91 r13725 on both Mac OS X Yosemite
  10.10.5 and Windows 8.1, both 64 bit.

  I'm using Inkscape to build figures for scientific manuscripts and a
  frequent occurence is files that are around 1-2 Mb in size because
  there are hundreds or thousands of identical objects (dots for a
  scatterplot, see attached file for a test case). Two versions of
  Inkscape behave very differently:

  0.48.5 r10040 works as expected
  0.91 r13725 performance begins to degrade with increasing numbers of objects 
in the file, with a pause between clicking for text editing and a visible 
effect on screen. In the end, this version is not usable any more for editing 
pictures containing scatterplots.

  I also tested the last development version 0.91 r14326 custom and it
  behaves like the stable 0.91.

  The main problem and easiest to reproduce is slow text adding and
  editing. However, selection of objects and movement also show a very
  large latency. Steps to reproduce:

  1. Open attached file
  2. Try to add new text. First letter appears in 1-3 seconds after typing it, 
and the next appear after various latencies.

  The same file opened in 0.48.5 can be edited, with new added text
  appearing as expected, almost as soon as it is typed.

  This bug is very troublesome since I have dozens of figures done with
  older versions of Inkscape that cannot be edited any more with the
  newest version.

  Possibly related with https://bugs.launchpad.net/inkscape/+bug/1481479
  (copy-pasted my comment on that bug, with some additions).

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