Do Shopify apps slow down my store? How many is too many?

Most apps inject JavaScript and CSS into your storefront, and that's where the cost comes from — not the number of apps, but how heavy each one is and whether it loads on every page. A single badly-built reviews or popup app can cost more than five lightweight ones.

To find the culprits, run your store through PageSpeed Insights or WebPageTest and read the third-party breakdown — the slow apps show up by name. Then for each ask: does it load where it isn't needed, and is it earning its keep? Disable it on a duplicate theme and re-test to measure the real impact. Keep what drives revenue, drop the 'nice to haves', and prefer apps that use Shopify's app blocks over ones that inject global scripts.