A method, system, and computer program product for updating and serialization of a document, includes: assigning a unique ID to each node created in the document; materializing a root element start tag of the document; materializing a start tag for a child element of the root element; determining whether a change to the child element is required; in response to determining that the change to the child element is not required, skipping content of the child element; in response to determining that the change to the child element is required, updating the child element to form an updated element; pushing updated information for the child element into a mutation map; and serializing the document using the mutation map.