Comment 17 for bug 906952

- some further changes have been made in rev 11010 to try to speed up the calculation of the visual bbox without affecting its shape. I think this is the most trimming that can be done without affecting the shape.
- Details at http://inkscape.13.n6.nabble.com/Inkscape-slowing-down-td2854391i20.html
- any testing would be welcome.