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Message: [QUOTE="Carl Banks, post: 3897222"] Not really, but if you want to avoid the delay in setting the dictionary elements (I'm guessing that is why you don't want to iterate over the list--and parenthetically it's not iterating over the list but adding dictionary items that is driving the time, and that cost is unavoidable), you should consider adding the position elements on demand. That is, instead of running a big loop once to add position to all ten million elements, just run the loop on individual pages. def get_page(start,end): page = list_data[start:end] for i,item in enumerate(page): page['position'] = start+i return page That might not work depending on what you are doing but you should consider it. Carl Banks [/QUOTE]