Reproduced on Windows 7, Inkscape 0.91 and trunk rev. 14761.
Steps:
1. Open the attached test file.
2. Select one of the 16 arrows.
3. Duplicate it.
With 0.48.5, the duplication is immediate, with 0.91, the delay increases with the number of objects. The very first duplications are quite fast (but not as fast as with 0.48.5), but then it takes about a second with the 10th object.
Reproduced on Windows 7, Inkscape 0.91 and trunk rev. 14761.
Steps:
1. Open the attached test file.
2. Select one of the 16 arrows.
3. Duplicate it.
With 0.48.5, the duplication is immediate, with 0.91, the delay increases with the number of objects. The very first duplications are quite fast (but not as fast as with 0.48.5), but then it takes about a second with the 10th object.