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Google is always looking for ways to keep the results loading speed between mobile and desktop at equal speeds. The only hangup here is Google also want sot give searchers as much information as they can before they click on a result. It is a tight, delicate dance to provide the best search engine marketing experience for both companies and users.
Will adding larger images slow the results speed down? Maybe. Google wants to know if the larger image format will be helpful to generating qualified web traffic to sites.
GIF source: http://weheartit.com/entry/12466306