Speedy Corners

Printing vases seem to have an odd problem on my Kossel Mini - there are tight corners in which the print head movement is very fast. It causes thin strands to form. I'm using Slic3r. The only setting that seems to make sense in terms of speed settings is "travel" (speed for non-print moves). But the vase still has material that should be in these locations.

Thoughts on how to correct this? Photo attached of the outcome.