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Assets/Mirror/Components/PredictedRigidbody/PredictedSyncData.cs

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+// this struct exists only for OnDe/Serialize performance.
+// instead of WriteVector3+Quaternion+Vector3+Vector3,
+// we read & write the whole struct as blittable once.
+//
+// struct packing can cause odd results with blittable on different platforms,
+// so this is usually not recommended!
+//
+// in this case however, we need to squeeze everything we can out of prediction
+// to support low even devices / VR.
+using System.Runtime.InteropServices;
+using UnityEngine;
+
+namespace Mirror
+{
+    // struct packing
+
+    [StructLayout(LayoutKind.Sequential)] // explicitly force sequential
+    public struct PredictedSyncData
+    {
+        public float deltaTime;         // 4 bytes (word aligned)
+        public Vector3 position;        // 12 bytes (word aligned)
+        public Quaternion rotation;     // 16 bytes (word aligned)
+        public Vector3 velocity;        // 12 bytes (word aligned)
+        public Vector3 angularVelocity; // 12 bytes (word aligned)
+        // DO NOT SYNC SLEEPING! this cuts benchmark performance in half(!!!)
+        // public byte sleeping;           // 1 byte: bool isn't blittable
+
+        // constructor for convenience
+        public PredictedSyncData(float deltaTime, Vector3 position, Quaternion rotation, Vector3 velocity, Vector3 angularVelocity)//, bool sleeping)
+        {
+            this.deltaTime = deltaTime;
+            this.position = position;
+            this.rotation = rotation;
+            this.velocity = velocity;
+            this.angularVelocity = angularVelocity;
+            // DO NOT SYNC SLEEPING! this cuts benchmark performance in half(!!!)
+            // this.sleeping = sleeping ? (byte)1 : (byte)0;
+        }
+    }
+
+    // NetworkReader/Writer extensions to write this struct
+    public static class PredictedSyncDataReadWrite
+    {
+        public static void WritePredictedSyncData(this NetworkWriter writer, PredictedSyncData data)
+        {
+            writer.WriteBlittable(data);
+        }
+
+        public static PredictedSyncData ReadPredictedSyncData(this NetworkReader reader)
+        {
+            return reader.ReadBlittable<PredictedSyncData>();
+        }
+    }
+}