Comment 4 for bug 167869

i have verified the same problem...
but i've noticed that's this occurs also -in my case- when the svg is very simple, but inside it has references to external images.
the -eventually- attached images (jpg, tif, ...) inside of the svg, seems (obviosly) be directly involved to the time of drawing preview.
the only way i've found to solve it is... simply turn off preview when i'm working with this files...
for the developers: i suggest (if it isn't yet implemented) the following possible solutions:
(1) -for the preview- the "scanner" of attached-images must try to look if the attached images have preview-image inside of them
(2) if the attached images are exceding a defined size limit (for example, 2Mb), put a dummy-image... (for example, "preview too big")...
(3) the preview drawing program must not freeze the inkscape running process