1. A method for identifying redundant structure of asynchronous web content, the method comprising: determining, by a processor, whether a document object model (DOM) includes a repetitive pattern of a combination, the combination including a tag of a leaf node and a tag of a parent node of the leaf node; responsive to determining the repetitive pattern of the combination, identifying, by the processor, a first inner cluster based on collapsing multiple instances of the repetitive pattern into a single instance of the repetitive pattern; generating, by the processor, an LSH (locality sensitive hash) signature for the first inner cluster based on the single instance of the repetitive pattern; determining, by the processor, an outer cluster, based on grouping one or more inner clusters, including the first inner cluster, into a section rooted at a source node of the DOM, wherein the source node is a parent node of the one or more inner clusters; and responsive to determining that a pair of outer clusters are near repetitive, identifying, by the processor, one outer cluster of the pair of outer clusters that are near repetitive, as redundant content; wherein: the pair of outer clusters are near repetitive based on comparing the LSH signature of the source node and a sub-tree of the source node, to the LSH signature of a distant node of the DOM and a sub-tree of the distant node.