Shogun is built with SEO in mind. Here are a few things to note:
We generate really clean markup.
You can set your page title and meta description inside of Shogun, using the Advanced Setting feature.
Page load time is determined primarily by Shopify's CDN, as they are the ones who host and serve your pages. We serve up images via our provider UploadCare, and we serve compressed images to ensure faster load time.
It's impossible for us to know how Google ranks content, but all the content created in Shogun is search engine readable.