With my LyX developer hat on:

It is known indeed that LyX has problems with the way display is handled. 
Unfortunately,
nobody is has the right amount of knowledge and free time to fix that currently.

I would be interested to know what happens if you add to your preferences file 
(usually in the ~/.lyx directory) the
line:
  \use_qimage false

This will make LyX use a Pixmap (that lives in the display server)
instead of an image which lives in main memory.

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https://bugs.launchpad.net/bugs/353449

Title:
  lyx 1.6.x impossibly slow

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