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# How to Tell Which App Is Actually Slowing Your Store Down
- URL: https://debugly.dev/shopify-app-script-audit-third-party/
- Published: 2026-10-09T11:25:00.000Z
- Updated: 2026-10-17T05:48:30.000Z
- Description: Uninstalling apps one at a time and re-running Lighthouse is not a method. Here is how to attribute main thread time and bytes to a specific app in one pass.
- Author: Rohit Bhadani
- Tags: Shopify, Deep Dive, Performance, Tooling

| App               | Requests | Transferred | Main thread | Blocking |
| ----------------- | -------- | ----------- | ----------- | -------- |
| Reviews           | 6        | 218 KB      | 640 ms      | yes      |
| Upsell            | 4        | 141 KB      | 380 ms      | no       |
| Chat              | 3        | 96 KB       | 210 ms      | no       |
| Analytics suite   | 5        | 74 KB       | 190 ms      | yes      |
| Wishlist          | 2        | 31 KB       | 40 ms       | no       |
| Currency switcher | 1        | 9 KB        | 15 ms       | no       |
| **Theme**         | 8        | 71 KB       | 120 ms      | no       |

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Published on [debugly.dev](https://debugly.dev/) by [Rohit Bhadani](https://debugly.dev/about/) | Founder of [Krova Cloud](https://krova.cloud/?ref=debugly.dev)