Hello!

I bought CC3 recently and have been messing around in maps. Recently, I've been working on making a fairly large map with a continent. I want to add some forest terrain that traces my coastline, however, I've been having some issues with this. Whenever I select the area of coastline that I want to trace the program begins lagging massively, and then if I move my mouse to the next location I want to trace the program will sometimes trace backwards, tracing the entirety of the continent except for the small section of coastline that I want to trace.

Is there a way to solve either of these issues, or am I just using the trace function incorrectly?

Thanks!