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This library, also available via Nuget, provides the FastBinaryFormatter class, an IFormatter implementation as a replacement for the standard BinaryFormatter for serialization purposes. It has the following features:

1. It has a higher upper limit for the number of objects being serialized. The standard BinaryFormatter has a limit of ~13.2 million objects. The FastBinaryFormatter limits 2^31 reference-type instances and poses no limits to value-type instances.
2. It runs faster and is less memory-demanding, especially during deserialization.
3. Serialization streams typically have smaller size compared to the ones produced by BinaryFormatter and they are not compatible.
4. Serialization streams are portable between 32 bit and 64 bit applications.
5. Relies on the standards. As a consequence, existing serializable classes, like those in the .NET base class library, need no change. Specifically, it supports:

• SerializableAttribute
• NonSerializedAttribute
• OptionalFieldAttribute
• OnSerializingAttribute
• OnSerializedAttribute
• OnDeserializingAttribute
• OnDeserializedAttribute
• ISerializable
• IDeserializationCallback
• IObjectReference
• ISerializationSurrogate

The significant performance gain comes at the cost of not supporting a very specific scenario:

During deserialization, if a registered ISerializationSurrogate returns in method SetObjectData a (non-null) different object than the one supplied to populate, then the data supplied in the SerializationInfo must not recursively cause a deserialization cycle up to the new object. A cycle is allowed though if it is established outside the deserialized objects. In particular, cycles formed by associations created by other surrogates are allowed.