Maximum Unity Navmesh Agents?

How many navmesh agents can Unity’s pathfinding system handle effectively?

This depends on your computer, in an offical unity benchmark on chrome (the webGL benchmark) my browser (chrome) with a Dual core 4GHz CPU handle 1320 navmesh agents before go lagging (<30 FPS). Generally unity can handle a lot of nav mesh agents alone, but if your code is unoptimized (no coroutines, lots of calculations on Update function and FixedUpdate and similar) the maxium number will go down.