Why is this website so slow on mobile [shopify]
Open up the client's Shopify Admin, and examine the theme. Does it have any strange slow code in it? Examine the Apps installed that directly affect theme. Are any of them crap, old, broken junk?
The best way to debug a slow theme is to just start hacking out any junk the client may have added to their theme. A lot of themes are so bad, for example, they load jQuery 3 times. Likely you have one bad apple in there, a call that is blocking and takes way to long to timeout or respond. Developer tools can point these out to in your console. Mobile versions have to come with a developer console you can inspect too right?
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