Payments Apps for Shopify — Performance Ranked
3 benchmarked checkout payments and buy-now-pay-later apps, ranked by real JavaScript overhead measured in StackConflict's clean-room lab.
3 Apps benchmarked
2 Grade A or B
18 ms Avg CPU cost
72 ms Avg mobile CPU
★ 3.1 Avg merchant rating
FASTEST
Klarna Payments is the lightest checkout payments and buy-now-pay-later app we've tested — 73.45 KB payload and 18 ms CPU (Grade B).
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How we measure — Each app is injected into a clean Shopify dev store in a Playwright-controlled browser with no other apps installed. V8 CPU cost is the ScriptDuration delta before and after injection. Mobile estimate applies Google Lighthouse's 4× slowdown factor.
Read the full methodology →