Will Tadow slow down or alter my storefront and theme?

No, Tadow does not modify your theme or affect your storefront's performance: the app does not install any script on your storefront. Shopify permissions are limited to reading your catalog and orders, plus writing to product pages when you publish a FIX correction. Nothing is injected on the front end, so your theme, load times, and visitor experience stay unchanged. Any correction remains visible and editable from your Shopify back office, like any other product page.