performance enhancements

use shared materials for every mesh
only bundle one shader: "Legacy Shaders/Diffuse"

Main.cs

@@ -16,17 +16,23 @@ private void InitGround()
         ground.transform.localScale *= 5;
         ground.transform.localPosition = new Vector3(24.5f, -1, 24.5f);
         GameObject.Destroy(ground.GetComponent<Collider>());
-        ground.GetComponent<Renderer>().receiveShadows = false;
+        Renderer renderer = ground.GetComponent<Renderer>();
+        renderer.receiveShadows = false;
+        renderer.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
+        renderer.sharedMaterial = Materials.sugarscape;
     }
 
     private void InitCapsules()
     {
-        for (int i = 0; i < 100; i++) {
+        for (int i = 0; i < 400; i++) {
             GameObject agent = GameObject.CreatePrimitive(PrimitiveType.Capsule);
             agent.name = "Agent" + i;
             agent.transform.localPosition = new Vector3(Utils.RandomInt(50), 0, Utils.RandomInt(50));
             GameObject.Destroy(agent.GetComponent<Collider>());
-            agent.GetComponent<Renderer>().material.color = Random.value < 0.5 ? Color.red : Color.blue;
+            Renderer renderer = agent.GetComponent<Renderer>();
+            renderer.receiveShadows = false;
+            renderer.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
+            renderer.sharedMaterial = Random.value < 0.5 ? Materials.male : Materials.female;
         }
     }
 }

Materials.cs

@@ -0,0 +1,24 @@
+
+using UnityEngine;
+
+public class Materials {
+
+    public static readonly Material sugarscape;
+
+    public static readonly Material male;
+    public static readonly Material female;
+
+    static Materials () {
+        sugarscape = new Material(Shaders.Legacy.diffuse) {
+            color = Color.white
+        };
+
+        male = new Material(Shaders.Legacy.diffuse) {
+            color = Color.red
+        };
+        female = new Material(Shaders.Legacy.diffuse) {
+            color = Color.blue
+        };
+    }
+
+}

Shaders.cs

@@ -0,0 +1,16 @@
+
+using UnityEngine;
+
+public class Shaders {
+
+    public static class Legacy {
+
+        public static readonly Shader diffuse;
+
+        static Legacy () {
+            diffuse = Shader.Find("Legacy Shaders/Diffuse");
+        }
+
+    }
+
+}

scene.unity

@@ -292,7 +292,7 @@ Camera:
   m_Enabled: 1
   serializedVersion: 2
   m_ClearFlags: 1
-  m_BackGroundColor: {r: 0.19215687, g: 0.3019608, b: 0.4745098, a: 0}
+  m_BackGroundColor: {r: 0, g: 0, b: 0, a: 0}
   m_projectionMatrixMode: 1
   m_GateFitMode: 2
   m_FOVAxisMode: 0