Eagle cam job: "Warning: (..) polygon causes extremely large plot data (..)"

Hi, I get this warning for the first time ever (when starting a cam job for Gerber files on a finished board). A polygon attached to VCC net and used to cool a SMD regulator seems to cause issues. When I go ahead with this job it takes ages to complete. What did I do wrong with that polygon?

Problem solved: I had to change the polygon width from 0 to a larger value.