Started using defold 2 weeks ago to the day. This is a custom flowfield C++ extension, stress testing 1000 pathfinding zombies, executing at about 8-11ms per frame.
Dynamic flow grid generation at runtime to detect obstacles dynamically. Dynamic group batching to reduce individual calculations per frame while retaining responsiveness. The more batch groups, the lower the execution time per frame allowing for a lot more than 1000 moving entities per frame.
Adjustable radial spacing per zombie to prevent clumping and overlapping and give hordes more natural looking shapes.
Extensions are awesome defold rocks.