iubenda vs OneTrust Cookie Consent: Shopify Performance Comparison
Both apps score Grade C — iubenda has the edge with 16 ms vs 25 ms desktop CPU execution.
Both apps provide trust badges and security signals functionality for Shopify stores. This page presents StackConflict’s independent lab results for both — measured in a clean-room environment with no other apps installed.
Head-to-Head Metrics
| Metric | iubenda | OneTrust Cookie Consent | Faster |
|---|---|---|---|
| Overall Grade | C | C | Tie |
| JS Payload | 433.46 KB | 496.5 KB | iubenda |
| CPU Desktop | 16 ms | 25 ms | iubenda |
| CPU Mobile | 62 ms | 130 ms | iubenda |
| Layout Shift | 0.0 | 0.0006 | iubenda |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-31.
iubenda — The Faster Option (Grade C)
iubenda scores Grade C with a JS payload of 433.46 KB and 16 ms desktop CPU execution. Mobile CPU: 62 ms. Even as the faster of the two options, merchants on mobile-heavy stores should weigh its impact on their combined app stack.
View full iubenda speed report →
OneTrust Cookie Consent — The Heavier Option (Grade C)
OneTrust Cookie Consent scores Grade C with a JS payload of 496.5 KB and 25 ms desktop CPU execution. Mobile CPU: 130 ms. This places it in the heavier half of StackConflict’s benchmark dataset — merchants running mobile-first stores should evaluate whether the feature value justifies the performance tradeoff.
View full OneTrust Cookie Consent speed report →
When to Choose iubenda
- Its unique feature set has no lighter equivalent in StackConflict’s database
- Your store traffic is predominantly desktop
- You have already removed or lightened other heavy scripts to compensate
When to Choose OneTrust Cookie Consent
- Its unique feature set has no lighter equivalent in StackConflict’s database
- Your store traffic is predominantly desktop
- You have already removed or lightened other heavy scripts to compensate
Performance Verdict
Result: Comparable — Both apps score Grade C — iubenda has the edge with 16 ms vs 25 ms desktop CPU execution.
Both apps carry Grade C — see StackConflict’s full Trust rankings for lighter alternatives.
About This Test
StackConflict measures each Shopify app in an isolated clean-room environment — a single development store, no other scripts, Playwright-controlled browser. V8 CPU cost is the ScriptDuration delta before and after injection. CLS is captured from the same browser session. Results represent the median of three independent runs with outliers removed.
Data from the StackConflict Lab. Last updated 2026-05-31.