Welcome to WebmasterWorld Guest from 18.104.22.168
The question is, will having this large image size have any affect on my ranking?
I assume you mean Search Engine rankings...
Last time i checked, no, page weight is not a factor in SEO... but either you're splitting hairs over the difference between 5k and 20k, or you have a 650k logo and you have much bigger problems on your hands than SE ranking.
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