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["Marvin J." <1491064@xxxxxxxxxxxxxxxxxx>]

I have the same issue with inkscape 1.0beta1 (fe3e306, 2019-09-17) installed via snap on Ubuntu 18.04. 
But I noticed something potentially interesting though: for me, the *slowdown only happens when the mouse cursor is inside the inkscape window*.

Steps to reproduce:

1) Load a sufficiently complex file that displays slow text editing.
2) hit F1 (selection tool) and click on a text element
3) move the mouse cursor *outside the inkscape window*
4) hit F8 (text tool) and edit the text element via keyboard only (it's very fast for me)
5) hit F1 again
6) move mouse cursor back into inkscape window

This procedure makes text editing quite fast again. The slowdown is recovered if step 3) is omitted.
Perhaps this can help to point towards the cause, maybe something with updating the mouse cursor style (from arrow to text-cursor) is inadvertantly checking for potential overlap with *all* text elements?

Just my 2 cents. Hope this helps in nailing this bug down. It is a real
show-stopper (also using Inkscape for scientific figures and posters)

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https://bugs.launchpad.net/bugs/1491064

Title:
  Text editing very slow in 0.91 on files with many objects, normal in
  0.48

Status in Inkscape:
  Triaged
Status in inkscape package in Ubuntu:
  Confirmed

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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