Boat X is sailing upwind to a windward mark in a 6 knot breeze that remains constant. On this beat, the wind direction is such that X has to sail on port tack about twice as long as on starboard tack. When X sails her optimum upwind VMG angle on port tack, she is heading directly into a steady one-knot current. Therefore, X tries an experiment -- she pinches up slightly so the current is just hitting her lee bow. She sails this way for the entire time that she is on port tack during this beat.
Question: How will her performance compare to a similar boat that does not pinch above the current on port tack?
Correct Answer: Boat X will take longer to get to the windward mark
There is no such thing as the lee-bow effect! Boat X is on a moving rug, and no matter which way she points her bow she will still be moved in the same direction by the current. When X is pinching, her performance will be slower than when she is sailing her "optimum upwind VMG angle." Therefore, it will take X longer to sail to the mark than it will take a boat that sails her optimum angle all the way.