Figured this out. I opened dev tools and tried to load the site and saw that some instafeed.css was hanging, and the site loaded once it finally timed out and failed. Removed a line from theme.liquid and my site started loading quickly again.

Hi Everyone,As of a few days ago, my Shopify store (https://atoneboutique.com/) takes painfully long to load on Comcast. Sometimes it takes multiple minutes just to load the homepage. I'm fairly certain this is just an issue on Comcast. Shopify suppo...