How much Klaviyo slows a Shopify store
We measured Klaviyo on 496 Shopify ecommerce stores. This is the processing time it added on the typical store's homepage.
Heavy (300 ms to 1 second)
Klaviyo was heavy on 48% of the stores it was measured on.
Klaviyo's processing time varies a lot from store to store. Stores where it's light usually load fewer of its files. If it's heavy on your store, check which of its features and settings you have switched on.
Last measured on September 26, 2026.
All apps in the index · How we measure these numbers
ShopWeight isn't affiliated with Shopify or with any app maker listed here.
How it varied from store to store
The same app can take more work on one store than on another. It depends on how the app is set up and what else loads with it.
| Light (under 100 ms) | 71 of 496 stores |
| Moderate (100 to 300 ms) | 163 of 496 stores |
| Heavy (300 ms to 1 second) | 237 of 496 stores |
| Very heavy (over 1 second) | 25 of 496 stores |
Compare Klaviyo with other email and SMS marketing apps
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