Hello everyone,

I work with Inkscape nearly every day, but am now experiencing some
painfully slow performance with some files (that I cannot share right now,
sorry!) I'm working with Inkscape 0.91 r13725 on Ubuntu 15.10 with an
i7-5500 and 16GB of RAM.

The designs are not particularly complex, but have one feature that
might be relevant: I'm working with dimension accurate objects that
can be very small, 0.1mm and below (I design printed circuit boards).
The slowness becomes painful when zoomed in onto the small objects; it
happens when I try zooming, choosing objects, moving them, and even
changing tools from 'node' to 'select'. nearly every such operation I
get the greyed-out Ubuntu stall. Working on the design when zoomed out
is not practical, but it is quite a bit faster performing.

Another thing that's happening that could be related is the following
prompts keep appearing on the console:

(inkscape:15569): Pango-CRITICAL **: pango_font_family_list_faces:
assertion 'PANGO_IS_FONT_FAMILY (family)' failed

(inkscape:15569): Gtk-CRITICAL **: IA__gtk_tree_view_scroll_to_cell:
assertion 'tree_view->priv->tree != NULL' failed

I could not find any report for how to handle these, and discover if
they are related to the performance problems.

Searching for a solution through looking at bug reports, I've tried:

* Running with fresh preferences.xml
* Geometric bounding box
* Reducing the complexity of the design
* Hiding layers (there are 24 layers) to only ones that are relevant
for the operation (usually only two layers)
* Hiding rulers and scroll-bars
* Maximising memory and threads (with restart)

I'm out of ideas, and I hope that someone might be able to recommend
something. If there are no ideas, I'll work on a design that I can
share so that we could work though it.

Thanks,
Saar.

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