Performance/load performance implement

Implement is in 'xmloff', and each element processing is divided into several steps:1 )processElement() : Process element2) _startElement() : Start element3) processSubContexts() : Sub elements process, if this element is a parent element.every sub element processing will be divided into three steps.4)_createChildContext(): Create Sub Context 5)_processSubContext(): Process sub element 7)_collectSubContext(): Collect the sub element's result data 9) _characters(): Process element's content10)_endElement(): End element11)commit(): commit the result data to parent elementAnd every parent element has three solutions to process sub elements:a) Serial processing b) Parallel processingc) delayed processingIn the 'content.xml' stream, It is 'c)' the top parent element of display element.In the 'settings.xml/styles.xml' stream, It is 'b)' the top parent element of setting/style element.And 'meta.xml', 'settings.xml', 'styles.xml', 'content.xml' It is serial processing.

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