Seems to be nearly identical render time here with it enabled or disabled: 5 minutes and 1 second vs. 5 minutes and 2 seconds for a 500x375 version; I will try full-size overnight to see if it makes a difference. The path does appear/disappear, so it's clearly changing the render, just not the render time. Keep in mind of course that I don't have the heightfields, objects, and other assets used, so it may depend on those, it's hard to say.
- Oshyan