They have banned left turns at most intersections as part of it. They were banned at many previously.Maybe the problem is the solution. It is so counter-intuitive to not allow cars to travel straight through.
Perhaps it would have been better to just ban left turns - which is the real thing that slows streetcars.
What used to cause delays on King, was simply that there were too many cars period. Most going straight. While a few cars still break the rules, most stay away completely. Allowing cars to go straight, would increase the number of cars on King significantly.