A commonly ignored factor for search engine optimisation is page file size. However, those that do pay attention to it seem to be living in the past – though possibly for good reason.
Some web designers/masters/administrators show complete disregard for any thought about page file size – the result being bloated monstrosities that freeze your browser until you delete your cookies. Their consideration for such details was cast aside when the majority of their target audience started using broadband internet – making download times minute even for goliath 500k + pages.