With regard to the performance when snapping to path intersections, let me also refer you to this recent comment by Diederik van Lierop (who implemented most of Inkscape's snapping features and is constantly working on improving it):
<https://bugs.launchpad.net/inkscape/+bug/847457/comments/2>
(Snapping to path intersections is inherently a costly operation performance-wise)
With regard to the performance when snapping to path intersections, let me also refer you to this recent comment by Diederik van Lierop (who implemented most of Inkscape's snapping features and is constantly working on improving it): /bugs.launchpad .net/inkscape/ +bug/847457/ comments/ 2>
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(Snapping to path intersections is inherently a costly operation performance-wise)